[Boatanchors] Help with 75A4 reduction tuning knob

[George Morton]

If it wasn't for bad luck I wouldn't have any luck at all.
This beats the "my dog ate my homework."

I had a nice 250TL tube made into a lamp atop my 75A4.  The cat was napping 
behingd the radio and
took off when she heard me come into the radio room.
First she knocked over the lamp breaking the 250TL, the lamp base fell off 
the radio and struck the tuning know "just right" to send the knob crashing 
to the floor.
The knob hit "just right" and shattered into a dozen pieces - FUBAR!!!

I am thus in dire need of a reduction tuning knob or entire assy. to effect 
repair.  Anyone have one available?
Would be most grateful for any assistance.  Of course I'll pay whatever is 
fair and reasonable.  TIA & Brgds,
Geo