Any Unertl Experts?

ssapach

ssapach

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I had a small mishap while taking a scope off a rifle. The screw inside one of the mounts, used for tightening the mount to the base on the rifle, has broken off.

Am I in for a real adventure here to fix this?

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Thanks for the reply.

I hope it's that simple, I was more so hoping to have someone chime in as to whether or not there are any special considerations when doing such a procedure. The base has a threaded hole through to the other side, but I'm not sure if the screw is a press fit into the knob or if it's also threaded into the knob. Hate to try drilling it out when it could just be tapped out, but I hate to start hammering on it if it's threaded.
 
ssapach said:
Thanks for the reply.

I hope it's that simple, I was more so hoping to have someone chime in as to whether or not there are any special considerations when doing such a procedure. The base has a threaded hole through to the other side, but I'm not sure if the screw is a press fit into the knob or if it's also threaded into the knob. Hate to try drilling it out when it could just be tapped out, but I hate to start hammering on it if it's threaded.
Click to expand...
either way I would think it worthwhile to apply heat to the knob while twisting the stub counter clockwise with good (Klein) needle nose pliers.
 
Would there be room to cut a slot for a flat blade screwdriver? Dremell tool with a cutting disk ? It could also be removed mounted on a Lathe and drilled out . Could also screw on a nut and weld/ braze it ( thats how I remove brocken truck wheel studs) the heat helps if its jamed in there .
 
buzzmagoo said:
Would there be room to cut a slot for a flat blade screwdriver? Dremell tool with a cutting disk ? It could also be removed mounted on a Lathe and drilled out . Could also screw on a nut and weld/ braze it ( thats how I remove brocken truck wheel studs) the heat helps if its jamed in there .
Click to expand...


Slotting is a good idea, but I'm not sure I have or can even get any cutters small enough to cut a groove in the broken screw ends.

Also have to be careful with any heat/welding ideas. The mount is made of aluminium.

My experience with removing steel from aluminium threads is not pleasant, but at least doable.
 
If you are afraid of too much heat...tie it to a piece of thin wire and suspend it in a saucepan of boiling water for 20 minutes....that will cause the aluminum to expand.
 
All sorted out......sort of.

The knob was easy to remove the broken screw from. Put it in the lathe and used a left hand drill bit from the knurled side of the knob. Grabbed on and spun the piece out right away.

The rest, stuck in the aluminium bracket, was more of a struggle. There is a tiny set screw holding the main screw in place, had to remove that first. But the main broken screw didn't want to just spin out, not even with pliers and heat. Took a bit of drilling, picking and then finally pushing the remains out with a tap.

Luckily the darn thing is just 6-40 threads, so I should be able to get a new screw long enough to fit.

Learning experience. Just glad there wasn't some hidden trick to remove it properly and safely, without damaging the whole mount.
 
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