I was going to plug the holes for them ( I punched a couple of 3/16" diameter blanks out of the seat post offcut) which I was going to fuse in place, but ran out of time because the owners wanted to come and pick it up. Copper is a better weld backer, but aluminum works pretty well. The seat post is plenty long at 12-3/4". In the pic it is inserted to just below the lock mechanism. I believe this is all the massacring that may be necessary (hopefully!).


For some reason this site will not let me post some pics? Anyways, it looks like they could have almost 8" of seat tube sticking out if they wanted.