[R-390] Megacycle Knob slips

[Robert Sisco]

Friday, I ordered the PD-2 product detector for my R390A. Wouldn't you know it.
Saturday, the next day,  the Megacycle knob slips/spins. I found the clamp in front of the Megacycle gear loose, but I tightened it all the way, until it's lips closed. The Megacyle knob still turns, 
without moving the Megacycle gear. I can move the Megacycle gear with my fingers.
All the gear mechanisms work properly.
What do you think needs to be replaced, the horizontal shaft. the Megacycle gear, or
the clamp? What holds the shaft in there? Is there any way to avoid taking the front panel
off? (I have the Bristol wrenches.)

Regards, Robert Sisco K5LYT 
361 992 9348
When it rains, it pours.