[R-390] 390() vs 390(A), R-391

[Dan Arney]

RE: The locking keys. I s my understanding and seems to work fine if the 
skirt is about 3/16 from the panel.The pin then comes just to the face 
of the knob. Another way to set it is to lock the pine snugly with the 
knob set screw loose and the position the knob and tighten the set 
screws. The pins are made right to the drawing.
The locking is done when the end point and threads just about bottom 
out. It is like a pawl/lever clutch locking system.

Hank
KN6DI

ARR/15 is same.
ART-13 locks up slightly different with less effort but positive.

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