I want to convert a L/W from flat to coiled spring driven hammer. The only problem I see is where to drill the holes in the breech block. I know I can buy a set of H/W - L/W drawings but am cheap. Does anyone have measurements to place the holes in the breech block?  I assume the measurements are a distance from the edge of the block and another from the bottom, top, a hole, or ?  Anyone done this?

Don't know much about Win's but hasn't it been determined that the flat spring has a faster locktime that the coil spring.   ledball

Are you sure about the main-spring holding the lever closed in a coil-spring gun? If that is correct, what is the object of the spring/plunger arrangement at the front of the receiver that the tab on the coil-spring lever rides against?

The flat spring holds the lever closed on a flat spring action and a spring plunger holds the lever closed on a coil spring. The flat spring lever has a hump across its face and the coil spring lever has a hump in the middle of it. The flat spring action has a hole through the front of it that the spring goes through. The coil spring action does not have this hole. The flat spring hammer has an extended nose the spring bears against, the coil spring hammer does not have this nose.

Frequent poster FITZ has a high wall that somebody converted from flat spring to both spring system. It still has the original and fully functional flat spring, but also has a coil spring installed.  In a personal conversation years ago he was discussing it and said that it just didn't seem to work as well without both springs present.  I'm not sure whether either or both of the springs had been altered as far as their overall strength, but they did both seem to have their full function.  Go figure...   

Froggie

desert-dude:

Many thanks! Just what I wanted. I'm not sure I understand the .08 and .088 measurements or the #28 and #50 drill sizes (I assume) but the hole location info is info is exactly what I need. I too hope the case won't be a problem. Again - thank you!

Frog, I made the change. The action is an early Thick Side flat spring action that I built into a 32-40. One day while looking the system over it occured to me that I could stiffen up, (Decrease lock Time ?) by incorporating a flat spring AND a Coil spring simply by installing one of the early relieved Hammers and adding the coil spring holes to the breech block. The first Winchester relieved hammers still had the front spur for the flat spring. I think it was an effort by Winchester to improve lock time. So, I went thru the process and ended up with a hammer strike that in fact broke two Hammers that I had lightened up with holes through them as Pope did. So went to a solid relieved hammer and it has held up quite well. I shot that Rifle very well for a long time. BUT! if you wanna get an education dry fire a Rifle set up this way looking thru 15X scope at 200 yds offhand makes you aware why 200 yd Zero's can be so different from the bench to Offhand. The muzzle dip has to be seen to be believed. HTH. By the way this system is so stiff that some folks have a problem trying to let the Hammer down with their thumb or even cocking the hammer with the thumb. Regards, FITZ.