Cosa 2 Clutches

Are they designed to last more than six months?

Mine's only got fifteen hp going through it. It's had the posh bearing/pusher and the posh (DRT) nut/washer in it.
Yet.. still it's dragging.

I'm aware about the getting the turrets to 22mm, but shouldn't they be checked before they're dispatched? At least, last longer than six months and six thousand km.

 

Anyone had one last any longer?