Gents:Slightly off topic, however model'21-related. Need comments ts from the 21 experts.

After shooting 100's of sporting clays and trap targets with three different model 21's I recently noticed that the screw
which comes up from the bottom through the head of the stock works itself loose.

The trigger guard has to be removed in order to tighten this one.
Has anyone else experienced this?

Should this screw be set in Locktite?
Any comments appreciated.
Perly88