glknineteen Posted January 31, 2014 Share Posted January 31, 2014 (edited) I bought a 10-8 rear sight that fills in for a bomar on my LB premier II. It's an awesome sight by the way, for anyone who's on the fence or wondering. Anyways, I had the bomar removed, fit the base of the 10-8 sight to the notch, pushed it in, installed the set screws, and screwed down the sight leaf. Beautiful!! Now for my problem... I took the gun out along with an allen key magnatip bit and the screwdriver to zero the sight with my handloads. Then I ran into my first problem. The large screw that holds the sight leaf in is a really shallow flathead, and try as I did to match the bit perfectly and hold it square to the screw, I stripped the little bastard anyways. Oh well, it was still marginally usable, so I moved on. Next, loosen the two set screws and push the base over to zero the gun. As I loosen the first screw, the tip of the bit breaks off, perfectly flush with the top of the base, giving me nothing to grab on to the pull it out. I finally got the base off the slide, but the piece of bit is still stuck in the set screw. I've tried tapping it with a mallet, using a pick to hit the top of the chunk to move it, tried using breakfree to loosen it up, nothing. My next thought is to either heat it up or cool it down in the freezer, hoping this contracts the metal enough to loosen the deathgrip. I've tried rare earth magnets, but its really in there. I'm thinking if freezing and heating fails, I'll have to have someone drill it out, and start over. Any other suggestions? Edited January 31, 2014 by glknineteen Link to comment Share on other sites More sharing options...
StraightUp_OG Posted January 31, 2014 Share Posted January 31, 2014 (edited) Get a new screw? ETA: if I understand correctly the screw is not stuck in the sight just the broken piece of allen bit is stuck in the screw? Edited January 31, 2014 by StraightUp_OG Link to comment Share on other sites More sharing options...
Flatland Shooter Posted January 31, 2014 Share Posted January 31, 2014 If there is loctite on the threads, heat the screw to break down the threadlocker, If you drill it out, go undersize and drill it from the bottom. If you get lucky, you might then be able to push out the remains of the allen wrench. With a good quality allen wrench, see if it will back off. If not, get a correct size easy out. Stick the sight in the freezer for a few days, Pull it out and lock it down in a vise. Then try to work it loose with the easy out. http://www.grainger.com/category/machining/ecatalog/N-big/Ntt-screw+extractor?redirect=easy+out When I run across a shallow flathead screw, like on the Bomar sight, I take a slightly oversized bit and grind it down just enough that its a good fit. Then keep it in your shooting tool kit for future use. Good luck. Link to comment Share on other sites More sharing options...
glknineteen Posted January 31, 2014 Author Share Posted January 31, 2014 I'm thinking maybe a little loctite got into the head and bonded the broken bit into the hole. I'll try heating it to boil out the locktite. Link to comment Share on other sites More sharing options...
nheiny13 Posted January 31, 2014 Share Posted January 31, 2014 Try to super glue the broken bit too something small like a safety pin tip. Then pull it out. It would have to be precise though, so that the glue doesn't get on the screw and bit tip. Link to comment Share on other sites More sharing options...
Gcarr Posted February 1, 2014 Share Posted February 1, 2014 Tool companies make small chisels just for this type of .... Pain. Get on of them and tap the set screw off center ( on the edge) in the direction it needs to turn to remove it. Then replace with a new one. Do not try to drill though the broken Allen wrench head ... That is extremely hard metal and the drill bit will slip to the side. If you have to drill ... Do it on the bottom of the set screw. Hope this helps !!! Link to comment Share on other sites More sharing options...
B45C22 Posted February 7, 2014 Share Posted February 7, 2014 I read this the other day and the exact same thing happened to me today. Bit broke off flush with the head in a c-more mount screw. It is in tight with loctite (the screw). I'm leaving it and hoping that the shock of shooting the open gun will dislodge it at some point. Bah! Link to comment Share on other sites More sharing options...
Ming the Merciless Posted February 7, 2014 Share Posted February 7, 2014 Give the broken wrench tip a good shot of penetrating oil like PB Blaster or Liquid Wrench so that the open areas of the hex head are full of liquid, then using a needle-tip air gun shoot high pressure air (90+ psi) straight down into the hex head. The air blowing the liquid down into the hex head will hydraulically lift the broken wrench tip out of the hex head. Be careful not to shoot your eye out! Link to comment Share on other sites More sharing options...
mildot1 Posted February 7, 2014 Share Posted February 7, 2014 Faster way than the freezer. Get a can of compressed air, Hold it upside down and shoot it on to the offending part. This forces the CO2 out of the can and it is much colder than your freezer. FWIW Link to comment Share on other sites More sharing options...
latech15 Posted February 7, 2014 Share Posted February 7, 2014 Perhaps a combination of the previous two suggestions would work best..... Link to comment Share on other sites More sharing options...
txmac66 Posted February 12, 2014 Share Posted February 12, 2014 Tool companies make small chisels just for this type of .... Pain. Get on of them and tap the set screw off center ( on the edge) in the direction it needs to turn to remove it. Then replace with a new one. Do not try to drill though the broken Allen wrench head ... That is extremely hard metal and the drill bit will slip to the side. If you have to drill ... Do it on the bottom of the set screw. Hope this helps !!! If you absolutely can not get it any other way try a "dental burr" in a dremel. Same tool the dentist uses on teeth, I have used them to grind out a broken apex on more than one occasion. Go super slow till the broken Allen tip is gone then use an EZout. Link to comment Share on other sites More sharing options...
Gcarr Posted February 12, 2014 Share Posted February 12, 2014 Just a note ... A great way to remove a Allen head screw or bolt when the head is striped out is to use a torx bit. Tap the torx bit in and turn. I use torx bits instead of easy outs all the time. Most easy outs only have four edges of contact ... The torx bit has double that. And yet another way is to cut a slot and use a screw driver, but this hard to do without messing the surrounding surface up. Locktite can be some bad stuff... Heat will melt it and tapping the screw up and down (from both directions) will sometimes break it into a powder if there is wiggle room between the treads. Hope this helps. If not... Mail it to me (include a six pack of bud lite). ? Link to comment Share on other sites More sharing options...
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