Problem drilling into frame, when installing uPVC door restrictor

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
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Just drill the pilot hole straight through the metal and use self tapping screws to attach what you need. Brad
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Thanks Brad but I suspect the metal will be too thick (3 or 4mm?) for a self-tapper. I guess I will have to tap the holes and use bolts. Steve
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Ah, that would make sense, I didn't realise how thick the metal frame was. Brad
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