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Singleshotlover
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Regarding the screw on the top of a win low wall a
Mar 18th, 2016 at 12:44am
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Does anyone have an idea what is the purpose of the screw right behind the hammer on the top of a win low wall action? One suggestion was that it when screwed down put pressure on the spring and the part that the spring bears on giving a lighter trigger pull. Another purpose is to allow a tang sight to be mounted. The few win wall actions I have seen had a tang sight mounted and had an extra screw drilled and tapped and the subject screw was still there. Thank you,Frank
  
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Re: Regarding the screw on the top of a win low wall a
Reply #1 - Mar 18th, 2016 at 3:15am
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If your upper tang has the Winchester roll marking, you should only see two screws, and the screw just behind the hammer (about 2 & 3/16ths inches from the screw that holds the buttstock to the frame) is simply there to fill the screw hole if you didn't ever get around to installing a tang sight.
If you did choose to install a tang sight having the original Winchester factory tang sight screw spacing, you would remove the filler screw from the factory drilled and tapped hole (and set the filler screw away), and then install the short tang sight front mounting screw into that same hole when installing a tang sight.
The filler screw wasn't intended by Winchester to be long enough to make contact with the sear spring when installed in its normal position (with the top of the screw flush with the top of the tang).
On those few Winchester "wall" actions you have seen that had a tang sight mounted and had an extra screw drilled and tapped and the subject screw was still there, it sounds like some people decided to mount tang sights on their rifles that were not made with the original Winchester factory tang sight screw spacing.
  
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Re: Regarding the screw on the top of a win low wall a
Reply #2 - Mar 18th, 2016 at 10:16am
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Here's pictures of two "wall" upper tangs.  The first picture shows 3 screws.  It is an early production.  The middle screw goes through the tang and into a threaded sear spring.  Loosening the screw would allow changing the sear spring pressure although I don't think it was designed that way.  The second picture shows a later tang with only two holes.  Winchester decided to tap the upper tang from the bottom leaving a blind hole and holding the sear spring with a screw from the under side.  Both methods also involved different sear springs.  Notice that there are no roll markings on either tang. As mentioned, screw closest to the hammer was for a tang sight and had a filler screw in it from the factory.  Bob
« Last Edit: Mar 18th, 2016 at 10:54am by Old-Win »  
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Re: Regarding the screw on the top of a win low wall a
Reply #3 - Mar 18th, 2016 at 11:03am
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This is the little screw that adjusts sear engagement on my HWW.

      Joe.
  
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Re: Regarding the screw on the top of a win low wall a
Reply #4 - Mar 18th, 2016 at 4:51pm
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When were the early production 'walls made with 3 screw holes in the upper tang?  Years or SNs?
  
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Re: Regarding the screw on the top of a win low wall a
Reply #5 - Mar 18th, 2016 at 8:51pm
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The following excerpt is from The Winchester Book by George Madis, on page 273:

"The sear spring screw initially had the head outside on the upper tang; a gradual change was made so by serial numbers after 13,000, all sear spring screws enter from the inside. To the end of production the screw continues to enter the receiver from inside, but near the end of production the end is no longer visible in the upper tang. ..."
  
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Singleshotlover
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Re: Regarding the screw on the top of a win low wall a
Reply #6 - Mar 18th, 2016 at 11:30pm
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The serial number is in the 75,000 range. It does have the blind hole for the sear spring. And only two holes. The one by the hammer and the other is for the tang screw. While I do not have the barrel screwed on and the flat mainspring installed, screwing the screw in question does lighten the trigger. And wether or not this was by design or simply happened that way I do recall a post a long time back that someone had tried this and said that carefully adjusting the screw did in fact lessen the trigger pull. I thing that maybe a shim under the sear spring would accomplish the same thing. Many thanks to all of you who were kind enough to respond to my post. Raining cats and dogs down here. Frank
  
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Re: Regarding the screw on the top of a win low wall a
Reply #7 - Mar 18th, 2016 at 11:40pm
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If you must shoot, shoot the cats.

      Joe.
  
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Re: Regarding the screw on the top of a win low wall a
Reply #8 - Mar 19th, 2016 at 12:09pm
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The screw under the hammer pictured above is not part of the Winchester design and must have been added by someone as a modification.  The sear spring screw is located 21/32" rearward of the front tang sight hole and was inserted from the outside until around SN 13,000.  After that the sear spring screw was inserted from the inside and the end of the screw was exposed on the top surface of the upper tang.  Later in production the sear spring screw was inserted into a blind hole and the end was not exposed on the surface of the upper tang.  There are no exact production dates or serial numbers for these changes.

Incidentally, these were the only design changes of the receiver made by Winchester during the entire production run of the Single Shot.
  
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Re: Regarding the screw on the top of a win low wall a
Reply #9 - Mar 19th, 2016 at 1:35pm
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Wincatcher, not exactly true. There's a bit of change from the flat spring frames to the coil spring. And, the takedown ones are a further change from those. But, in the overall scheme of things you are correct in saying that those boys who made 'em did it really well from start to finish. Unlike, say, Detroit with it's perpetual recalls to fix stuff.
  
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Re: Regarding the screw on the top of a win low wall a
Reply #10 - Mar 19th, 2016 at 3:40pm
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Winchester's factory designed method for giving you a  lighter trigger pull was to install their "optional" set trigger assemblies.     Wink
  
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Re: Regarding the screw on the top of a win low wall a
Reply #11 - Mar 20th, 2016 at 12:07am
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Again many thanks for your comments and information. Frank
  
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Re: Regarding the screw on the top of a win low wall a
Reply #12 - Mar 20th, 2016 at 6:47am
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Wincacher wrote on Mar 19th, 2016 at 12:09pm:
The screw under the hammer pictured above is not part of the Winchester design and must have been added by someone as a modification.


That is correct. The only screw I'm aware of that was meant to adjust sear engagement. I've seen others with the same non factory modification. 

         Joe. 
  
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