Denis Sharon wrote:

Can anyone tell me just what means was used to tighten and loosen the
serrated/ribbed/knurled thin nuts used on panel-mount toggle switches?


There is some info in the r.r.a.b FAQ -
http://www.virhistory.com/ham/rrab.faq.htm

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It is a poor job that doesn't require at least one new tool !
(I don't know whether these are still being manufactured or not, but
here are some leads)

Techni-Tool listed 2 adjustable knurled wrenches, 1/2" and 5/8", for
$13.20 ea. The collet in each allows 1/16 adj to allow for finish
thickness. Brand is listed as "Knurl-Tite", stock# 388WR014 for the
1/2" and #388WR016 for the 5/8".
Techni-Tool
5 Apollo Rd, Box368
Plymouth Meeting, PA 19462
Phone 215-825-4990 sales 941-2400 fax 828-5623

Also look for GC electronics GC-9358 (1/2") and GC-9359 (5/8")
A distributor is Jay Tronics @ 815-965-8786 (speak to Joe) and are
priced as follows: The smaller size wrench is GC catalog #9358 for
1/2" nuts @ $15.35 and the larger size is GC catalog #9359 for 5/8"
nuts @ $11.95.
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73 & Have Fun,
Nick KD4CPL