Shaft still drilling in the master cylinder!!

so using a steel bolt seemed to stop the drilling of the clutch shaft in the Master Cylinder however I just started having clutch problems again and it turned to be the shaft is getting shorter now!!! I extended the end of the shaft with a 50 mm custom made screw to fit and lubed it well. However it's getting close to the very end!! and it's scaring the heck out of me! It's really not fun to start a Vtwin with no clutch and make only right turns around to avoid cops and the red lights! lol .. This has been happening since I changed my clutch my shaft has been rotating and it has drilled out about 1cm of Aluminum inside the master cylinder and the Shaft since two months. What do you guys think I did wrong when I installed the new clutch?

BTW am I refering it right when I say Master Cylinder? I mean the Cylinder with a Piston which pushes the clutch shaft to engage the clutch! Correct me if I'm wrong thanks

bearing #8 could cause that, would making the the bolt #16 too tight cause this also? it obviously not catching up with the RPMs of the Clutch plates if it did it would drill away too faster i believe...