Need help with a Kodak M70

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I don't think I have ever found a decent projector "In the Wild" off the top of my head, anything by Kodak is to be avoided (They have two distinct lines-the Instamatic Series, like your M70, and the later Moviedeck series, which looks nice, but the performance is just dismal).

GAF also made a popular line of projectors, they tend to have bad belts, and shred film acordion style because of the awful auto loading feature.

Bell and Howell also had a popular series of autoloaders: avoid all of them.

I own, or have owned, a Bolex SM8, GAF 3000s, and a Chinon two track stereo model. I think I probably paid 100 dollars for each of them (shipping would be included with that total). Note that I shot down GAF projectors in the above-while their silent models are terrible, their sound projector models are really a nice bargain-I believe they were made for GAF by Eumig or Chinon-such is the 3000s. The best of the best models were made by Bauer and Elmo, and command high prices.