Elmo ST-180E M 2 track Feeding intermittently - belt seems to be tight?

[Teressa Longo]

New problem. Old projector. Can not pinpoint what part is not co-operating...After pressing down auto threader lever, feeding the trimmed head into the grove, turning on light of projector, self threader pops up and the film stops transporting.
Looking online I only see videos and articles on replacing a belt that has a different capstan configuration from my projector. (see foto). After testing tension on belt doesn't seem loose to me. (see foto). The belt is not corroded or sticky. Any ideas?

[Nantawat Kittiwarakul]

Right after the autoloader guide pops up, does the motor spins but the rest just stay freeze, or motor does not move at all?

[Teressa Longo]

everything moves...But think I found out the problem late last night, I will check again tonight. It's embarrassing, stupid user error.. not paying attention...but maybe it will help someone. I kept trying to thread the tail into the auto threader, (there was a head leader on it...). So it wasn't engaging the perks...How long have I been working with super 8? Too long for this mistake! I will blame it on low light while working, long time since I've revisited this projector and senility!

[Brian Fretwell]

Don't worry. It tookl me three attemps to thread a film I bought recently beofre I realised it hadn't been re-wound and was like that!!