Originally Posted by
contender1
Some of the housings are aluminum. Not uncommon.
Loose screw for the housing is also an occasional problem. Several have gotten loose, then snapped off under recoil.
Ruger has used (2) types of screw mounting for the ERH. One, a threaded stud inserted into the barrel, and the other, direct threading of the barrel.
I can't recall the thread pitch,, but any good machinist has a thread pitch gauge to check such stuff. I'm not in my shop or I'd check it. And yes,, clean up the area, then carefully run the bottoming tap in there. Also, you can use a die to clean up the screw. Or just get a replacement screw. Ruger can supply one easily. And often for free. Degrease, and use a removable LocTite,, can work. I've also used a piece of fishing line, inserted into the screw hole, added the screw, then melted off the tail of line. The nylon line acts as a thread locker.
I hope this helps!