The Medway Handyman wrote:
Clive wrote:
Hi,

I think the part of the lock that is in the door frame is the strike
or keep. Well, that part, in my uPVC door (possibly most), is a metal
plate with a slot screwed on to the uPVC frame. Well one of the
screws holding the strike at the top of the door is loose and will not
tighten – the screw just rotates. As a result the strike slips and the
rod in the door sometimes will not pass into the strike. I can
overcome this by pushing the strike back into position by hand.
However, I have to tell visitors who have a key to door this if the
door does not lock. So, Is there some material I can “inject” into the
current screw hold in the uPVC that will reduce the size of the hole
and stay in place in the frame, thereby allowing me to tighten the
screw and fix the strike?

Drill a bigger hole & coutersink in the metal plate, and use a larger
self-tapping screw.