Aaron, the bike being worked on now (and another one to come) have handlebars like your Twenties. In the shop, I pulled the handlebar stem to its maximal height, and that might be OK for me, but it's hard to tell (is there a limit line there as well?); once the bike has been tuned up, I can see by getting on the bike with someone holding it. I know I'll have to get that seatpost up very high, as long as I mind the limit, right? If I need to order a longer seatpost, you would recommend the Kalloy 400mm with 28.6 mm diameter, correct? Would that be readily available, typically? Can one order a replacement handlebar stem for a Twenty that could bring the handlebars higher? If so, what length and diameter would that require? Many thanks!