My old Rollei P35A slide projector, purchased new in Hong Kong in 1969, has developed a focus problem. I just mounted a better lens, the Rollei-S-Projar f/2.5 90mm, so perhaps the better lens made the problem more apparent. The focus is different left to right on the projected image so I assume the slide is misaligned in relation to the lens. Taking the cover off I can't see any obvious way to adjust this. Has anyone any experience with this? Failing a DIY fix I'd probably look for a replacement on Ebay. I'd like to keep and use my new lens. What are the better Rollei projectors? Is the P350 any good? Allan