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Re: Guide for changing discs & pads
If going down the centre with a drill smaller then the core diameter, often the thread will collapse and self release.
So like Noel says..3.5 diameter should do it.
I've started with the smaller one before, using the hex hole to aid in centering the drill. It's sometimes enough on it's own.
Currently in Dancingdad's garage:
Qashqai 1.6 spark driven, Kia Sedona 2.9 TDI, Scenic II 15DCi 2004 (SORN) not quite RIP.