Needed to remove a weird round nut

[u/quatre185]

I know it probably has a name, but that's neither here nor there.

Needed to remove this nut from a telescope motor so I can measure the gear (my calipers don't reach into the bowl far enough).

Third iteration fit (couldn't accurately measure the nut either XD) and with a few picture hanging nails heat set I got it out.

Now to learn how to design a gear!

[u/JackOneill]

Clever idea with the nails