Bravo - a major contribution and a stimulus for all those who lack welding acess to get off our butts and start experimenting. Some metal may be rigidly epoxied to wood for axles and perhaps even the pivot. Is there any reason not to use a coaster (back pedal) rear hub for the pivot? Some tandem coaster hubs have sturdy bearings and threaded ends for strong connections. Just pondering as I consider the options Regards to all pythonauts Brian in SC USA