A blast from the past? On page 1 I explained that I did one for Carl Phillips (rip).
I have never used tower gearboxes. The extra idler gear is another source of noise, and the gearbox shows. I am not going to look up the part number, so this part number is only for the 1/4" axle, and the Williams needs a metric size.
I used two metric axle equivalents of the NWSL Mod O.6 part 653-6, one with a wor m shaft long enough to extend from the rear cylinder front face all the way to within 1/4" of the motor shaft. I used a pittman 8534 motor (ball bearings, silver graphite brushes), and Toyota #0 hose between motor and rear shaft.
K&S tubing is used to make shaft size compatible with the hose. Easy to solder.
Between engines I use Speedometer cable with a square slip-joint.
The newer NWSL gear cases need to be adjusted to ensure proper mesh.
