Popsicle stick question

[tbone9]

Here’s a picture of a t20 in a parts machine I found for a good deal. I’ve never seen any on here like this one. What’s the deal with the metal “clip” over the top? Some sort of keeper?

[racerone3]

Here s what is under that clip. this one is in my tank trainer. I asked about it years ago and no one really chimed in with any details

[JoeMeg]

So the pivot pin holes are threaded on this version. I like the "spacer" nut, Hustler 880 inner bearing flange technology, lol. Wonder if the chunk was taken out with a hammer or something else attempting to bend the retaining box nail over?

[tbone9]

Thanks. I’ve got the u channels and seen pictures of the ones like yours but the clip threw me off.