Kodak Instamatic M22 not working?

[Zanda Bayfield]

Hello

 

Recently purchased a Kodak Instamatic M22 off ebay for £10 with some new film, the listing stated it was not tested but i took a chance anyway. So it came and didn't work, turns out the batteries had corroded so i cleaned it out and popped in some new AA's, pressed the exposure and sure enough the motor buzzed away like a bee. However having opened up the catridge slot i could see that even though the motor was working the film cartridge turner thingy wasn't moving, after a browse online i found out these things have weak gears that break so i got out the screwdriver and took it apart, all the gears are in great condition so i don't know what could be causing this to not work.

 

Any help much appreciated, thanks