RCA BTA-1R1 conversion -- request for a part

[K8DI]

Between being sidelined by a busted arm and orthopedic surgery, cold weather in the garage, and lack of time, I have made only a little progress on my transmitter conversion.  Finally got grid drive set up and fully functional, got all the stepper motors installed on the tune and load caps and roller inductor, RF plumbed, and the remote control built. It all works.  But. It doesn't, at all.

I could not get the network to tune. I was pretuning it with a VNA on the output and a resistor in place of the plate load, no resonance, one off-frequency resonance, no adjustments worked, why!.  Well... The roller inductor shaft is hot/connected to the roller.  It is coupled to the stepper motor shaft. The motor is grounded....

So, does anyone have an extra insulated 3/8 x 3/8 shaft coupler they'd part with?  The surplus places want an outrageous price for one, I am hoping one of you could help me out.

Ed

[W7TFO]

One insulated 3/8" coupler yours for postage.

PM me your addy.

73DG