I don't own one, but I do know some folks who do. You can either give me a list of your questions and an Email address where they can reply to that I'll forward to them OR you could subscribe to "Tandem@Hobbes" and ask your question there -- as that's where they "hang-out" on the Web.
You can find out how to subscribe to Tandem@Hobbes by going to the following URL:
As for others who build these types of "convertible" tandems, there are several builders, including but not limited to the following:
Bilenky, near Philadelphia, PA, created the original "Triplicator" http://www.bilenky.com/index.htm
Meridian Tandem of Eugene, OR, has built several.
Dennis Bushnell of Bushnell Cycles in Washington State has built several.
Rodriquez of Seattle, WA, created something called the "8 Ball" and may be building these types of tandems.
There may be others but these are the ones I know of off the top of my head.
Last edited by TandemGeek; 01-30-05 at 09:27 PM.