Yes, this describes a key which was made with a rotational offset....
3. Examining the notch-alignment around the circumference based on their positioning relative to the alignment-tab ("gun sight") it's clear that the new-key is notch-misaligned. I estimate that the notch-pattern is rotated roughly 20 degrees clockwise compared to the old-key. The old-key is pretty symmetrical; the new-key is rather asymmetrical as regards notch-position :-<..
Yes, this describes a key which was made with a rotational offset.
This isn't a perfect depiction, but gives the idea:
Is this what you're seeing? (an offset)
I would think depth might also be an issue, but this offset is the killer.
Yes, that's correct. The original key is steel; the new NF6X key is brass.
@pbirkel@gmail.com - Am I to understand this was one of our trial keys from NF6X?
DEC# ACE CODE CPU
XX2247 7654321:5173757 PDP-8 (Classic)
XX2247 7654321:5173757 PDP-8/e
XX2247 7654321:5173757 PDP-8/I
XX2247 7654321:5173757 PDP-8/L (and expansion box)
XX2247 7654321:5173757 PDP-8/m
XX2247 7654321:5173757 PDP-11/20
XX2247 7654321:5173757 PDP-11/30
Plastic Un-Cut PDP-11/44 (any ACE key works)
XX2247 7654321:5173757 PDP-11/45
XX2247 7654321:5173757 PDP-11/60
XX2247 7654321:5173757 PDP-11/70
? 7654321:7557537 PDP-11/730 (VAX)
XX2247 7654321:5173757 PDP-11/750 (VAX)