[R-390] Slow speed KC knob

[Bill Hawkins]

R390rcvr at aol.com (Randy) wrote:

"Would have to be careful about the 10 turn stops!"

That's why the 389 has a slip clutch in the drive and knob.
The 50 turn PTO has more rugged stops than the 390.

Things people do to destroy 389s:

Replace the knob with one without the slip clutch, then
break a stop and bust the PTO core. Maybe use an electric
drill on the knob shaft.

Oil the clutch so the motor can't turn the gears.

Bill Hawkins