In article , zeno writes:

you calibrate the tuning dial by using the Xtal as a reference
knowing it is at the stated Xtal frequency when the magic eye peaks. I assume
you
use the little knob next to the dial for this tweaking? or do you loosen the
dial
and re-set it according to this calibration?

All the xtal tells you is whether the dial is close or not. Recalibration is a
shop procedure. The dial is pinned - don't try to change it.

The little knobs next to each control are locks to prevent the settings from
changing in flight.

73 de Jim, N2EY