Just a quick bit on Thumbprint, based on my one and only experience:
Sent off a Fatty Headshok fork to them a few years ago. Sent a new bearing unit as one was a bit gritty. Marked the old and new ones with marker pen.
Fork came back with the same air leak I’d sent it to be fixed, and the bearing hadn’t been changed. Basically, as though nothing at all had actually been done to the fork. Plus, they kept my new bearing.
£90 that cost me, plus P+P. I’d never send owt to them again, although plenty of others have had good experience with them. I ‘phoned them, and in fairness they did offer to have a look at it if I sent it back, but tbh I decided I couldn’t trust them. They denied all knowledge of the spare bearing, in spite of me telling the guy on the ‘phone about it. And they can’t claim it was lost in the packaging, because I taped the thing to the fork leg. Still had the sticky tape marks on it when I got it back.
Piss poor ime/o.