Carl Gulbronson showed a exercise stand to convert a
regular bike into a “spinning” bike. It looks basically like parts of an old
Monark ergometer with a big (8 kg) cast iron flywheel and a nylon strap
band brake with a handlebar control and spring for variable resistance.

The developer can't put the needed work into it any more and has literally
a ton of flywheels and partially completed units on hand, so it needs an interested
investor/businessman to take it over. Carl would be somewhat interested but is too
busy to take it on himself. If interested, check the website or talk to Carl, but
remember the old saying that the best way to make a small fortune in the bike
business is to start out with a large one!