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Also, as 3/32” gears go, they’re definitely on the taller/thicker end of the scale and don’t look like they’ll go in a 10-speed chain
They definitely won't, my friend tried putting a new 10 speed chain on a 7 speed and it broke on the first pedal stroke. Apparently a 1 speed difference either side in chain size is the limit, so he could have done an 8 speed chain on the 7 speed cassette, but the 10 speed was too narrow inside. It pushed the side plates apart.
boredom
I think you’re right, I’m going to forget this idea. I’ve actually got a couple of 6- and 7-speed blocks I didn’t know I had and they’re all as you’ve described. Some of the smaller cogs in the stack look like the spacer is part of the gear plate. Also, as 3/32” gears go, they’re definitely on the taller/thicker end of the scale and don’t look like they’ll go in a 10-speed chain.