Mel,
Thick powder on the lower portion of the boss CAN occlude a cant arm from sliding all the way on...Lightly sand the round section with a 200 grit section of paper pulling around the circumfrence, testing the fit often. The powder is pigmented the entire thickness, so a quick polish up with some rubbing compound should remove some of the scratches and brighten up the color if that is an issue for you.
Slimjoe, I've offered numerous solutions to repairing your Yeti..can the current builder not repair it or chooses not to attempt it?
cheers,
rody