At right is grand daddy Schwinn Exerciser
turned hand cycle, version 1.0 . Center is active MS patient Dave's 1st version..3 spd.
He wanted more gears, so his 2.0 got a fancy 7 spd. Nexus hub (left). His two feature toed-out rear wheels and folding seats for bleachers, instant backrests...! Rt. has floating deraillieur, left pair have old school floating chainrings..both styles used to keep the chains tight under power AND braking... deraillieur upgrades soon.
In motion! :