From: PWells 
Subject: [drakelist] Drake Plastic Part Deterioration


PWells  made an utterence to the drakelist gang
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  Gene
I being a Drake/Yaesu/Kenwood/Eico/Heathkit collector consider your post of
the upmost importance. I'd like to suggest a solution for certain plastic
parts deteriorating even when in storage. 
Knobs and 'buttons' on pots and selector switches: before storing, loosen
the set screws if the plastic knob doesn't have metal thread insert.
Draakes don't , Japs do. When the 'all plastic' knob is  tightened on the
shaft it becomes in a permanent 'stress' state. Therefore with time it will
give in, crack and spread open. So again when in storage for a long period
loosen the set screws.
Gene, for the knobs already cracked, 'crazy glue' (cyanoacrylic) can be a
'solution'. Apply the glue sparingly with the knob off the shaft, let
harden for two or three days and put back on. If there is a set screw don't
tighten it too much. For certain heavy band switch applications I think
that if the knob is cracked and a 'lot ' of turning power is required, the
knob will not hold. On some of my Yaesus there are band switches that
require (in my humble opinion) way too much 'turning power' . In this case
I play with the spring that presses against the detent balls. I force the
spring away from the ball repetitively and after a few attempts the
"detent' will become easier to overcome. Be carefully with this
technique as there is no going back if you 'unbend' the spring too much.
But it will make life easier for the old boat anchor and its band switch
knobs.
Whew!!
73
Peter
VE2FAR

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