I should have clarified, Loctite now also makes many glues. They originally were just a thread locker, and now I think make several versions of just that. But really, nail polish works just as well. Got the idea from a professional gunsmith.
Hi, the Loctite we know in Europe is made of a blue colored sticky filler stuff i wouldn't really call glue; you usually put that on metal nut-bolt or even tapered thread in metal to metal constructions that vibrate like used in a car. Maybe there's a wood friendly stuff for sale in the USA, i dunno ....
- If a screw hole in wood is worn i usually make a filler with some wood-dust and epoxy. Or just a little woodglue or cyanoacrylate (woodglue works better) with a chip of a match stick pressed into the hole, when you're in a hurry.
- With epoxy: put a little stiff soap on the screw itself and you can screw it in the hole when the epoxy starts to harden a little, making it possible to remove it again later. Don't over-tighten yet. Let it dry a while 'til the epoxy hardens out. The tightening depends on the drying speed of the used epoxy. Then tighten the screw later without too much pressure at first, until the epoxy has really hardened.
- If you got the time, fill the hole up with the above epoxy trick without the screw, and then after hardening (pre) drill a new screw hole. - Nout
Dwight is there a spacer on the screw between the button and the flapper? If there is no spacer to stop the screw from turning so that the button is tight up against it then the screw will keep backing out. If no spacer I can make one for you. Also I did see that on the Regal I worked on the spacers and the screw were really of a small diameter. If that is the case with yours it may need to have a bigger screw and larger diameter spacer. Otherwise it will keep wiggling around.
You just talked yourself into a job. Ok, just looked at it. It does have a spacer (pliable plastic somewhat like that heat shrink tubing used in electronics), but the screw diameter looks somewhat small.