Hello everyone! I'm new here, i'm italian, so please forgive me for my bad english. So, here the situation.. i'm a owner of a Honda Africa twin, which unfortunately has the crank shaft( where the pinion has to be inserted ) that has the teeth a bit worn. So i opted for a modify : I drilled the crank shaft , threaded the hole, then I screwed a prisoner m6 steel 8.8 with thread lock strong , so I paired two pinions(to expand the contact surface) and ended it all with a big washer and a simple self-locking nut. I give you some data: - Diameter of the shaft ( at the top of the teeth ) = 25mm - Diameter of the threaded hole = 6mm - Threaded hole depth = 16.2mm - Shaft length ( from the point of exit from the crankcase to the end ) = 22,8mm The question is: In light of these measures ,is it possible to estimate the safety of such a change ? the crank shaft is potentially subject to breakage ? you think I'm a fool to ride the bike with this change ? The motorbike has more or less 50 horse power. thank you so much for the help!