I have a Rollei vintage (1960's) Universal Projector P11. When I try to advance to the next slide, slippage prevents it to advance fully. What is causing the slippage and how can I fix it? Thanks
Rollei P11 slide projector slide advance slippage
Office Equipment & Supplies - Rollei - Rolleiflex Rolleimagic W/3.5 Xenar Lens-beautifiul Vintage...