In 1983 I had one. I was never able to make it work for me? Maybe it didn't like the Regina freewheel, or the Sedis chain? I do know that when I went from Suntour Barcons
to Campy DT shifters it got worse. Went to a Duopar after that and all was well. FWIW: I'm the only person I know to have had a bad experience with the Mountech, I got it at the time because several friends said they were great.

Cheers,
Chris