The square notches are for a spanner wrench. If you have one, plug it into a mating socket, clamp it in a vice, then carefully use what ever pliers you have to back out the notched ring mentioned above. On connectors that are this old, a little releasing liquid can't hurt, along with some gentle tapping around the edges. Patients and gentleness is the key.

Steve

KC4WN

On Fri, May 15, 2026, 2:19 PM Michael Hanz via ARC5 <arc5@mailman.qth.net> wrote:

Well, you are supposed to use a spanner wrench, but only nuts like me
buy them (from my engine building days, mostly).

You could also use a screw driver and tap gently on the handle end with
the driver end planted in one of the four gaps. You should cushion it
with a gum wrapper or similar. It shouldn't take much to break it loose.

- Mike

On 5/15/2026 1:03 PM, Mark K3MSB wrote:
> Yup… I see it now…. page 20 and 21. Also in the Table of
> Contents….. Duh…..
>
> I have two of them apart. I tried using pliers but the grip wasn’t
> good enough. I thought about using a vice but that leads to obvious
> dangers…..
>
> Thanks Mike.
>
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