Newfangled shapes

[Ron Ginger]

Yes, quite an old topic.

I dont really understand the shape you mean, please tell me a bit more about it. If there is enough interest I can add it to the set.

[fermanz]

This thread is getting even more stretched out, but still interesting.
I think, maybe, rwskinner, was referring to the mounting hole for things, such as toggle switches, where the locating cutout is a slot directly off the 22mm hole, rather than an offset locating pinhole.
Ross

[rwskinner]

Like Industrial control panels that have 20mm, 20.5mm, 30mm, and 30.5mm holes for operators and indicators.  These devices normally have a little indextab on them that keep them from rotating in the hole.  So the hole is round, but has a small notch in them generally at the top.