Velo Orange sells the well-made Stein unit for $45, might seem like a lot of $ but it'll last through your Grandchildren's lifetimes . You could also try to borrow one (or the use of one with the hands of the owner) from somebody on this forum who has one and is local. I made the offer to a guy in my SF Bayeria and did the job for him so I didn't risk the tool getting "lost" or damaged...and he got it done *right*!
http://www.velo-orange.com/jast23stcrpu.html