Need help with a Kodak M70

[Harvestman]

I bought a Kodak M70 8mm movie projector from the thrift store yesterday. When I turn it on, the motor seems to run fine, but when I try to put the leader into the slot that says "Film", it won't go into the slot. It seems like there's a sprocket down there, and something makes a clicking noise if the film is inserted a certain way, but it just won't accept the film.

Please help! I've got 20 reels of Super 8 film that are dying to be played...