Guess it will be those then... however, I suspect that OSB is "more brittle" than Plyfa, but if it doesn't work, I'll just drill. The wall that is going up is only 2 meters long, though cc30.
Do you use pliers or screw the steel studs together?
I think it works okay but what do I know. I pull on it and after a while, it goes against the steel rule and then the disc starts moving away from the rule. After a few more turns, the screw penetrates the rule, and the disc then starts moving towards the rule again. After a few more turns, the screw head begins to be drawn into the disc (countersink), I feel that the screw must be countersunk 3-4mm for it to really sit tight against the rule.
Is it a reasonable countersink?
Does that screw have what's known as frigänga, which is prescribed according to Säker Vatten?
Press hard when you tighten the screw. That way, you press the board close to the stud, which is essential if the screw is not to be unnecessarily countersunk too much. Now, I don't really think it matters that much with 15mm plywood, but normally, it's enough for the screw head to be countersunk about 1mm.
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