Correct me if I'm wrong but here's my theory, I believe there are 2 models for these, flat/older design that needs a washer and a newer design with a spacer
This is the flat one and the washer:
View attachment 1415132
This one is I believe similar to the one in the video:
View attachment 1415131
With the spacer protecting it:
View attachment 1415133
It was my theory that the spacerless older design could be more prone to cog slips as well
Edit: Or could it be a 752 vs. 751 thing with the 751's getting the better designed part? I didn't pay attention to where the parts came from, the serial years etc.
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