as I Expanded a rim rear hub and built a custom coaster,
I could not have gear .... and I missed it!
I'm inspired by old bikes (1900), and tractor mower gearbox!
I used bike gears, plexiglass and machined parts
I put two weeks to get the idea and create plans
and about 2 months to realize the gearbox!
there are three speeds and axis drive and output are the same
the selection system is brass
plexiglass box is to see the mechanism
Plans were made to the scale to facilitate manufacturing and various tests of setting up