Ahh Yes....
You see, the problem is with the tension.... Sort of like putting an oversized fan belt on 2 pullies and expecting the belt to turn...
Pro Reel to Reel machines (usually) have a tension system, where one reel floats and keeps tention on the tape....
All I can suggest is that you ask a buddy with a computer based sytem to loop if for you and put it on a cd....
Joe
PS.. if anyone else knows any other way, I would be interested to hear it.... I ran into this issue a few years back myself...