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I’m looking at re-spacing them
Never gonna happen. Sprockets smaller than 16T are mounted on the stub which extends outboard of the freewheel mounting thread. The 16T and up sprockets which wrap around the actual ratchet body are necessarily on a bigger spline. This means that you have a big shoulder on the body forging which has 3-4 large sprockets on a large spline, then a drop down to 2-3 smaller sprockets on a small spline, then 1-2 smallest sprockets with a built in spacer threaded to the body/one another to hold it all together.
The probability that you can move the big sprockets outboard with thin spacers and move the small splined sprockets inboard with thin spacers and grind down the built in spacer on the smallest sprocket(s) and still have it all assemble tight and correctly spaced for 10-speed is vanishingly small.
There's also a distinct possibility than the 3/32" 7-speed sprockets will be too thick to run and shift 11/128" 10-speed chain in an acceptable way.
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gbj_tester
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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.
Jonny69
It’s not for the ability to replace the gear plates, I’m looking at re-spacing them with thinner spacers to make an older HED wheel compatible with my retro indexed 10-speed setup. Just meddling at this point!