[ARC5] ARC -5 6743 Crank Replacements - I have a solution

[n3lll --]

As long as I have been messing around with ARC-5 radio's the achilles heel
has always been the tuning knob crank.  Most of the 6743's, when you can
find them, are pretty well beat.  I wonder if they were good when new?  I
am 74 and have never seen a new one.

I set about using modern tools and materials to recreate the spline
connection and improve upon the design of the original,  with the same
general form factor as the 6743.

Once I reproduced the spline, I needed a way to assure that the shaft was
aligned with the spline without any horizontal or vertical movement.  I
accomplished this by press fitting the shaft and its shroud  into a small
flanged 10mm ball bearing.  The result was a frictionless knob with smooth
operation and excellent mechanical stability.

If you want to see one in person, I will be bringing some with me to the
Dayton Hamfest, we will be in location 8332 in the infield.  Very easy to
find, it is the first stall to your left as you enter the infield from
the west end entrance.

Here is a very short YouTube of its operation ... tom, N3LLL

https://youtu.be/hTXW8KWkFsA

Info on the knobs is at http://www.kitparts.com/ARC5
<http://www.kitparts.com/ARC5> or email me!
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