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The spec sheet you link to is the correct one - but I heard back from US Digital - they literally have no legacy stock of the original encoder anymore.
US Digital E4-256-091-L
256 CPR, 091/2.3mm bore, Low Power Strobe
I've managed to get a motor (arrives monday I hope - Thanks Don @ BinTel for digging through the vintage gear!), but I am still keen to see if I can find an encoder solution for the future. If no one makes something suitable, it's going to be hard to repair these scopes in the future, which is just disappointing.
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