clutch arm shaft wear

First build and I know It's probably been asked before and will be asked again but I'm having a problem with the Clutch I've gone through 2 cam shafts And have another one but don't want to put it in and ruin it as well also I cut my own buckingbar from 8 mm drill bit And it seems to be fine...

Is it normal to have a clutch cam shaft to wear on the edge like this after a few hundred miles. Yes, the design seems bad with the sharp edged clutch shaft being moved by the clutch cam. If one cuts the sharp edge off the clutch shaft help? Grease more often? Not an expensive part and its easy...