Closeup of acorn nut and washer made from the base of an antique bathroom faucet that I pulled out of my waste brass bucket. Never throw anything away!
I will double up the 3/8 ply used for the seat base. If I don't use the tractor seat I will just put in a round padded seat, no backrest. Very comfortable sitting or standing at this current arrangement. Shifter is just at the right height for either and there is good clearance between handle and wheel. I am waiting for my switch before I decide where to put it.