My old racing bike has 1991-era Ultegra, but I have gradually accumulated a nearly complete set of Dura Ace 7402 (mostly new in box) and plan to upgrade the bike. 7402 was a transitional release and offered both downtube and integrated shifters; I have both. The bike is currently outfitted with downtube shifters. It is feasible to install integrated shifters on such a bike? What happens to holes and bosses for the old downtube shifters?
Generally, have people regretted making such changes to an old bike? Does anybody suggest I just stick with downtube levers?