That's not a c clamp
I have a tool similar to that, its a little bit different and from another name.
I tried it on my worn out trx 2.5 last year. I pinched it like the instructions said, and turned a craftsman allen wrench into a candy cane in the process...
I also polished the inside and outside of the sleeve with chrome polish, and some fine sandpaper on the outside to remove the ridges i left in it from trying to pinch it with vise grips. (So it would slide in without a hammer...) Apparently vise grips do nothing but put ridges in the outside
Anyway, the sleeve felt fairly tight. I lubed it up and put it in the engine, along with flushing the engine out and stuff. I ran it for a bit, it ran and started lot better but it was overheating constantly. I ran a tank or two fairly rich (factory settings), and leaned it out and used it. I assumed the sleeve pinched out of round and that it would eventually wear together. Well, a few tanks later it was acting the same before i pinched it.
I'm assuming the sleeve got pinched out of round and that I didn't pinch it sufficiently to stay pinched for very long. I suppose I need better allen wrenches.