Well several weeks ago my slug gun was knocked onto it's side due to a huge wind gust and hit the end of the eye piece where the threaded cap screws into. There was a small 1/4 inch flat spot and when I looked through the scope one cross hair was broken! I called several commercial scope repair places....6 months or so to get repairs and $150 or more. We have a master craftsman in the San Diego area who can do them but he was in the matches in New Mexico for several weeks, soooooo I figured I'll give it a try. I found the eBay address of the fellow who sells 0.0005 tungsten wire and I bought a double order. Got it in about 3 days and that stuff is so small I could not feel it and could only see it by light reflection from some LED lights. I used my head mounted magnifier AND a desk mounted one and could barely see it.


The tube that holds the wires slid out easily after pulling the two locking screws and then placing the tube onto a piece of Gorilla tape with adhesive side up. The holding screws (4) had the wire at 9 o:clock on one side and 3 o:clock on the other. I used a pair of surgical clamps to hold the wire and tighten one side then the other. The wire is sensitive and can't be pulled too hard. It took me 6 tries to get both wires screwed down and set 90 degrees to each other. I cut the end of the wire with a pair of small scissors with the points filed to a very sharp point.


I added a small amount of synthetic grease to the cross hair tube and it was just enough to have it slide in to he scope tube. I worked the small flat spot out of the eye piece without causing the lens to work loose, whew I was happy!!!!


I set the cross hairs so they are plumb, locked them in place and went to the range this past Wednesday and I was VERY HAPPY that there was only a small amount of height adjustment and zero horizontal adjustment needed to get the rifle onto the bullseye again! Since I did this on the desk at my computer I have found several 5 inch pieces of the wire in my keyboard and I thought it was some of my hair or beard! Damn that stuff is very fine! The part of the scope I found with the N2 gas is in front of the cross hair area with is not sealed so no issues there.

Congrats! 

Is the crosshair about right looking through the scope?  Would .001 be better?  .00075, maybe or do they even make it?

.0005 is a bit thick for me .0002 tungsten wire to me is being more like fine. I changed mine and the first thing I did was to loose the wire and never could find it. But I finally got it accomplished and if having the screws it's really not all that difficult and pretty hard if not impossible to screw up if you can see the damn wire.

Not to change the subject to much but Jackie Schmidt a Jacketed benchrest shooting from Texas and a top one at that. Uses one unraveled strand of carbon fiber from fishing line to get his ultra fine cross hairs that he personally prefers. When I changed the cross hairs in my Unertl and after very quickly loosing my piece of .0002 tungsten wire I ended up doing the same and could not be more happier with the end results thanks to Jackie's recommendation. For those who might not know him he is pretty much a scope expert. There was a time when he would freeze the internal adjustment's and use external to eliminate any point of impact changes and he did quite a few.

JLouis

Getting a single strand of anything is very hard. When I made a scope a few years ago I pulled out a single strand of dental floss and that took quite a while! In my case I ended up using cat's hair as the floss thread kept breaking and it showed up quite large.

Oldracer on the Unertl cell the strand goes under one screw and then over the top of the other screw. It does not go straight accross from one screw to the other and if doing so it won't be centered in the cell.

JLouis

Thanks JL, Save me the problem of finding a spider making proper web if I ever need a crosshair 

Your welcome BobZ and if I am in need again I would probably go with having Klarmann Rulings make me an etched glass to fit my cell or turn one out on the lathe that might be better suited. 
Also any bit of dust on the new wires will look like little boulders and a very gentle dip in acetone is generally enough to clean it off. If trying to blow it off you would more than likely have to start all over from scratch again. 

JLouis