Originally Posted by
Steve_sr
This is an interesting idea. Are you thinking a piece of pipe/tube extended off the seat tube to hold the reamer parallel to the seat tube?
The builder didn't say explicitly what they used but said that it was "standard industry practice" to use JB-Qwik-Weld. There is a piece of the existing shim missing where the reamer grabbed it. I am going to see if I can scrape some adhesive from the edges and see if it looks like JB.
I am also considering making a relief slot in the existing bushing using hand mechanical means or possibly hand assisted by chemical etch with sodium hydroxide (lye). From what I can find titanium should be impervious to chemical attack by sodium hydroxide whereas it will readily attack aluminum.
I would say coaxial rather than just parallel.
It might not ream great otherwise once you slot it. Reamers like to catch on edges.
If it has already peeled out somewhere I’d try to ream or peel out a bit more. The usual stuck seatpost remedies apply here. Take care when using lye, it’s hard on life, and especially eyeballs.