Krasnogorks-3 jammed

Hello,

So I recently followed the trend and got myself a K-3 and some film stock to practice with before starting to shoot. Anyway; after loading I'd run it at 24fps and the camera would jam after a few seconds, the "pressure plate" would slide down and I'd readjust it after which the camera would run again for a few seconds before jamming again.

Last time I noticed that the film got stuck in the cog wheel and I had to pull it by force to get it out. The film would break and a fragment of film would get stuck in the wheel and I'd have to spend about 20 mins trying to get it out with a needle... What am I doing wrong? Any suggestions on how I can avoid this? I tested it with Kodak Eastman 7222 - Single perf.

Worth noting is also that after inspecting the film that managed to loop through, I noticed that there were small horizontal scratch marks just below the perforation.

I apologize if this has previously been asked, I couldn't find this specific problem in the forum.

Thanks in advance,

Kaspar