What size allen wrench do you need to remove the Rotor Button on a Porsche 944?

Robertino

New member
tried 3mm - stripped it (too small)

1/8th is too big, wont fit

7/64 is too small stripped it.

need to know what it is before I strip it beyond use
I have a metric set. 4 mm as too big. are there half mm sets around? maybe i need 3.5mm
 
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