Uneven frame spacing?

[mattk]

New to RB67 and the space between frames is sometimes variable. My guess is this means the back needs adjustment and cleaning or is it junk (ProS back). Any recommendations on where to have it adjusted (besides Mamiya).

Thank you in advance!

Matt

 

[Markok765]

this happens with my rollei(35mm) have it ajusted at a repair shop mably a CLA