Some friends lent us a Santana tandem to see how my daughter and I like it. It's a little small, though, and I was wondering if anyone has a good source for a long (150mm?) 1 1/4" stem, preferably with a lot of rise. Until we get our own tandem, a new stem would make this one much more comfortable, and the 1 1/4" size seems to be a little tough to come by. Thanks!