Pursang

Cut some key-ways in a shaft.
5mm slots in a 3/4" 304 SS. round bar.
First time I've done one like this, rather pleased with how they turned out.
The mounting fixture might have been a tech school project, I found it at a garage sale.
It's bolted down to the cross slide vice on my little lathe drill mill.
Budget Chinese slot drill in the drill chuck, 'cos my collet chuck has imperial sizes (1/4" collets, not 6mm).

My front wheels have arrived. Chinese dirt bike, nice quality.....and the price... around $54 ea. with free shipping. Whoo Hooo!
These were on Aliexpress, you need to spend a fair bit of time sussing out the bargains and pay particular attention to the shipping cost.
Bit of tension while monitoring the tracking, they were held up at Chinese airport for a couple of weeks to get on special "oversize'" freight flights.
I actually got some discount vouchers because of the delays.

My original plan was to build my own wheels around some nice 1970's Yamaha MX hubs I have. Then sourcing the 17" rims and custom spokes, tyres, tubes and rim bands, add the time to assemble and true and we are looking at hundreds & hundreds of $$$$$ for 2 wheels.

Now that I have the wheels, I can finish the pillar spacing and the stub axle design to meet the track width spec.

Original plan for driving the trike was with a rear mounted engine and a swing arm. (Simple)
In order to fit it into the available space, I was planning to extend the motor drive past the front of the wheel and put the Torque Converter on the other side of the wheel. This was not going to be a problem as one of my 'donor' engines is from a portable generator. These have a tapered drive into the alternator rotor, press the rotor apart and away we go, extended shaft, (Simple). Next step was a short swing-arm pivoting in-line with the output sprocket of the TC. (Simple... sketch attached). For proper alignment with the wheel sprocket, I would need to place the drive sprocket on the inside end of the TC. (Simple) Apparently, this is possible with a genuine Comet TC. My Chinese clone, TAV20, on the other hand, has a 5/8" shaft through the rear pulley and drive sprocket, expanding to 17mm through the alloy bearing support. (Not so simple??) New Plan in development.