I have been having a problem with my Bell and Howell projector. It seems to project some films fine and have problems with others. (I bought a few old boxing reels on ebay a while back and one seems to always play fine, while the other gives me problems. I have also had problems projecting some of my own footage. It is an auto load super 8 projector.
The problem: the film starts out playing fine, and the loops above and below the lens are loose but not too loose (I'm not sure how to describe this accurately, but from what I understand, the loops are normal initially). The problem comes when for some reason the lower loop tightens up and the upper loop gets bigger to the point where so much film gets bunched up in the upper loop area that it bends and folds. The bends get pulled past the lens and turn into creases, and sprocket holes on the film are often ripped.
Before disaster happens, as the lower loop gets tight, there is a clicking noise that lets me know its about to happen. Sometimes if I push down on the plastic tab used for auto loading, the upper loop gets smaller again and the problem is solved, but other times, there is nothing I can do. If I try to rotate the nob that controls the lower loop to make it larger again, the loop just tightens up and the upper loop gets bigger again.
Any ideas about why this is happening and how I might fix it? Any help would be greatly appreciated. Cheers.