8
Oct
2014

A Tale of The EoTech Thumb Screw and Too Much Loctite

posted Wednesday, October 8th 2014 at 9:51 AM by

The stuck EoTech screw
The stuck EoTech screw

I don't remember putting on any Loctite, maybe I forgot or maybe it comes that way from the factory. In either case, here is how I replaced the EoTech picatinny rail screw with a thumb screw.

Installation Steps

First, always check to make sure the rifle is unloaded. Remove the magazine and visibly inspect the chamber for a round.

Check to make sure the rifle is unloaded
Magazine removed and chamber empty, this rifle is unloaded.

Using a 7/64 hex wrench, I can't get it to budge by hand and I'm feeling the wrench slip and start to strip the head.

7/64 hex wrench
Can't get it to budge by hand.

Time to grab a hand drill and a 7/64 hex bit.

Enter the 7/64 hex bit and a hand drill
Enter the 7/64 hex bit and a hand drill.

Using the bit and drill, I can apply pressure downward to keep the head from stripping.

Remove the stuck EoTech rail mounting screw
Remove the stuck EoTech rail mounting screw.

I'll replace the standard mounting screw with a Yankee Hill Machine thumb screw from Brownell's made specifically for EoTech mounts. It was actually cheaper than getting another replacement hex screw. Plus, I like the idea of it having the slotted head because the chances of me having a screw driver, or something I can use as one, are much higher than having a 7/64 hex key handy.

YHM Replacement EoTech Mounting Screw
YHM Replacement EoTech Mounting Screw

From there, its just a simple matter of right-y tight-y and bam! EoTech back in place.

EoTech replacement thumb screw installation
EoTech replacement thumb screw installation

Final Thoughts

Be careful how much Loctite you use!

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