[Johnson] Johnson KW Matchbox

Jerry Kessler N4JL at att.net
Sat Jul 4 14:45:48 EDT 2009


Steve.

To add to David's suggestion, use the minimum strength locking 
solution for the small screws of the Matchbox knobs.  An example is 
Permatex Low Strength Threadlocker Purple, which is intended to 
secure hardware under 1/4-inch and offer serviceability.  See:

http://www.permatex.com/products/motorcycle/motorcycle_thread_compounds/motorcycle_threadlockers/motorcycle_Permatex_Low_Strength_Threadlocker_PURPLE.htm

For greater strength and larger hardware, there is Threadlocker Blue 
and Threadlocker Red.

Jerry, N4JL


----------

At 12:49 PM 7/4/2009, David C. Hallam wrote:
>Get some Lock-Tite and put a drop on the set screw.  Just don't get the
>kind that is intended for screws that are not to be removed.
>
>David
>KC2JD/4
>
>Steve wrote:
> > I have two of the Johnson KW Matchboxes.
> >
> > The TUNING knob on one and the MATCHING knob on the other were loose on
> > their shafts recently and I tightened the knobs' set screws.
> >
> > I haven't kept any notes, but the knobs seems to loosen on the shafts
> > often enough that it's an annoyance. I don't recall if it is the same
> > knobs that keep loosening on their shafts.
> >
> > I guess that with use and over time, the set screw backs out a little,
> > thus allowing the knob to freely turn on the shaft.
> >
> > Is there a method to tighten the set screw and expect it to stay tight?
> >
> > Thanks.
> >
> > Steve K8JQ
> >
>
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