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Welcome... As you've mentioned, make sure the QR is tight on the adapter bracket. You should verify the QR is biting the bracket, and not just pulling up hard on the end of the axle. You may need to file 1mm or so off each axle end to insure this. Also, Charles and Eric will begin hounding...

If you like to tinker... ... I'd build a conversion. I have a garage full of them in various states of completion. But for me, a conversion is never really "finished", because I like to tinker. If you don't enjoy mechanical activities, I'd buy a completed bike or at least a V2K. But...

What bike are you converting? If it uses a 1 1/4 inch steerer (Cannondale, for example), there are better ways to adapt it. I don't think you can expand the steering column that much at the base and not have it crack...

Aha! Found it... http://cruzbike.com/adjusting-elliptical-or-ovoid-chainwheels http://cruzbike.com/qrings-silvio

Q-ring setup John T. developed a very systematic method for setting up elliptical chain rings in the process of creating the E-rings for the Quest.... I think it's posted around here somewhere...

Must use an external bearing bottom bracket... ... The front chainstay clamps attach to the outside of the bearing shells. The shell outer diameter needs to be 44mm.

Nice looking wheels... ... and they appear to offer a 130mm - spaced disc hub on a deep-rim aero wheel. Good find. Let us know how they work for you. (Pictures?)

Bifocals... I wear Varilux bifocals, and have no difficulty with vision while riding my Silvio 2.0.

Nice job, Tuloose... ... Love to see folks solve problems like this. The hardware store will likely have "P-Clamps" that would make this easier. http://forums.roadbikereview.com/commuting-touring-ride-reports/how-do-i-mount-rear-rack-146866.html (scroll down a bit...) SKS...

Given a lot of thought to this... Charles, The principal issue I've found with converting a standard tandem is the distance between the rear wheel and the front bottom bracket is generally pretty short - 22 inches or so in the frames I've measured. This can be alleviated somewhat by...