[CW] An arm looking for a key.

[Donald Kemp]

This is an arm that I can't find a key for. I've looked at online key
collections but I don't see a match.
The arm is about 3-1/8" long and 3/16" square stock.
The male screw for the knob is #8 and the threaded hole
for the contact space adjustment screw is #6.
The contact it staked; once on one side and 3 times on the other.
There is a hole between the contact and the arbor, it is not threaded.
It could be for a different contact placement for a bucket for a spring.
The arbor is 1-1/4" long

Any idea what key this belongs to?

-- 
73,
Don, NN8B
"Meanwhile, with ever increasing power, the telegraph has become not only
the master of commerce, but the tongue of mankind." - James D. Reid, 1886
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