Hi, I'm trying to fix a door restrictor to a uPVC patio door. Attaching the part that goes into the door's 16mm 'Euro groove' is fine. But when I try to attach the other part to the doorframe (underside of top, near-ish to corner) I'm having problems: when I drill a pilot hole (for the special uPVC screws) I hit metal behind the uPVC.
I presume I'm hitting reinforcing metal inside the doorframe. Unfortunately I don't have much flexibility in being able to use a different position (further from corner).
Any suggestion on how to get round this gratefully received.
Cheers
Steve