I had my beat to shit Scotty TEi3 Newport done by BOS. Came out great. Had it restored to original finish. I highly recommend them. Places like The Putter Lounge I hear is good as well but BOS was great and not a lot of money.
I think the only reason to go to Scotty restoration services would be if I intended to not use the putter again and was either a collector or was going to resell it for a profit. Which is probably just for the rare ones will you make anything after they restore it and give you a COA.
I looked into it for my Mizuno Scotty Cameron M100 putter and after their work Iād be lucky to break even on a sale. Iām going to just sell it as is, I got the rust off it, someone else can try their hand at it now.