I have TRP's on the Trice XL.
When I first looked at them they only had one pad adjuster in each caliper, so I ordered and fitted new ones.
Then couldn't get them to fit over the disc, even when they were adjusted right off!
So I stripped them, pretty clean inside but dry!
Cleaned lubed and re-assembled.
Still didn't fit so I took them apart again and compared them to one I have on another trike, everything looked the same & measured the same using Vernier's.
This time after I Assembled them, they FITTED!!! Yaay, whoo hoo!
(I still don't know why they wouldn't as everything was the same).
I have just stripped, cleaned & re-lubed them today ready for winter and they fit first time.
I like them because they don't distort the disc when used as a parking brake and left on for days at a time.
Unlike the BB7 that was fitted as a parking brake by ICE it made a zing,zing,zing noise after being left on overnight where the disc had warped!