I tend to agree with you. The cir-clip is a known problem. I wished I'd had payed attention to see if it was a consistent cir-clip moving or not I've been staring at the premature damage of a gear box for the last couple days in fact laying on the couch i can turn and see the exploded views in the manual thats been laying there for a couple weeks now. Believe it or not I use it as a quick reference

I'm thinking I need to fire up my computer and go thru my transmission photos. Might even find someone recording of his transmission operating with a drill motor

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If they were helical cut i could understand some lateral force on the clips but not being straight cut
...and if you stare too long the pictures they will start moving on the page...stop the meds and take a nap then