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Hi group, Just did some more research on the K-3 (mine is still stuck at customs, should arrive next week...). I found out that one main problem with the K-3 is that the loop formers retract when the spring loaded plunger is pressed (to check if the film runs smoothly), but they will return into position (squeezing the film) when the plunger is released and only retract (=open) again when the door presses against the plunger. So the loops might be gone bad. I refrain from disassembling the camera (seen it on YouTube: no way I'll attempt that). I also refrain from simply hacking off the loop formers and plunger. I am toying with the idea to come up with a way to keep the plunger down once I know the film runs smoothly. This also prevents pressure on the door (which I will seal with camera tape anyway). Any ideas (other than using sticky duct tape each time) how to keep the plunger down with some DIY method - without causing any kind of damage or risk of metal parts (filing, sawing etc.) getting into the camera? It is out of the question getting a "pro" upgrade (removed loop formers and servicing, polishing of parts) since it would again involve customs, hassle, waiting time and more money than the camera itself is worth. While I'm at it: I never understood why blowing air into the camera or mag would be of any use. Wouldn't it be much better to use a soft paint brush and a small, battery powered vacuum cleaner to make sure the dust really gets out of the way (instead of inside the camera/mag mechanism)? Just asking :-) Any reply appreciated, Christian