campy chain ring bolts are tough to remove once they are corroded. the t30 side of the bolt has a lot of surface area for corrosion. the best way i have found to remove these is the clamp a t30 torx in the vise and use an impact screwdriver. set the crank on the t30 wrench and use the impact screwdriver with the biggest flat bit you got. should free it up. i have used an impact gun on the t30 side but it can strip out. the t30 on the crank arm gets the impact gun or normal wrench. i use a pick to pick out the anti tampering plug
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