Don,
I bought a used 555 from Ten-Tec early last year and found the tuning to be
stiff indeed, even for a PTO design. Bravely (foolishly?), I took the thing
completely apart (this took some doing) and found that the PTO was spring
loaded, with three small plastic spacers to give the spring extra compression.
I took out two of the spacers and reassembled the rig, only to be greeted with
no audio output because I had forgotten to plug one of the cables back in (and
I had to take the rig mostly apart again to get to it). I was mostly satisifed
with the resulting tuning tension.
Some months later at a hamfest, I picked up a mil surplus knob that was a
*perfect* fit for the Scout and has a finger indent, further aiding tuning
ease. I found it was hard to locate a small enough knob with an indent, but
they are out there.
73, Michael, KC1SX
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