Hi all.my clutch hub is quite worn on my 1970 GTR and grooved up by the plates also the spline is a bit loose on the shaft.when riding the bike the clutch is a bit stiff but up shifts are good .when down shifting its as though im changing down without a clutch.if i hold the clutch in longer or let the revs drop it works better.anybody had similar issues.i dont suppose new clutch hubs are available?cheers