My Jobo CPA 2 drums are looking a little wobbly!

I know there are lots of stories about the motors wearing etc but the motor spindle on mine does not seem to have any excess play. It also looks like it rotates correctly. To me the coupling magnet seems to be the issue as when I tighten it in place it pulls one way causing it to lean slightly which in turn causes the drums to lean and wobble.

Has anyone had a problem with the coupling magnet rather than the motor ? Is any one aware of them wearing with use ? I am wondering if the brass collet wears with time and use and causes this problem.

I can still get hold of a new one but don't want to buy it if it won't cure the problem.