Had a bike delivered in a box and the seat tube collar was mangled and out of round. It was heavy guage steel and was not responding well to wedging with a small diameter pipe. Then it occurred to me that the bike had a powerful wedge in the handlebar downtube. I pull the handlebars off, slipped the hanblebar downtube into the seat tube just past the mangled spot. I then rotated the handlebar downtube so the wedge nut was located opposite the bent portion of the seat collar and tightened the handlebar wedge a bit. The bent part of the seat collar straightened predictably and after a couple of cycles of repositioning and tightening, the seat collar was rounded up nicely and the seat tube slid into place easily without scratching the finish. Tightened the seat collar quicklock, reinstalled the handlebars and moved on with
assembly.