I think its a long shot but does anyone have a disk brake mount for a non disk GT frame?
I know that Goldtec make one but was wondering if anyone had one they would be willing to part with?
There is a GT specific, BETD mount for sale in the forum. You have to drill 2 holes in your frame to fit. Have a look through, it's there somewhere.
Alternitavely, a2z's pop up from time to time.