Dr. Gerald N. Johnson, electrical engineer wrote:
Then make
sure the looseness isn't the knob. Tentec knobs aren't the strongest
things and the bandswitch knobs seem to be the first to split and get
loose on the shaft. I wedged a bit of wood in mine to hole the split
from getting wider.
I had the same problem with mine, but remedied it by finding a
suitable knob with an inner brass sleeve. Hasn't moved since. It's a
pointer-type knob so it works well and doesn't look out of place.
-- Ron VE3SP
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