To Part Out Or Modify

The top belt cover on the 820 (and I assume the 830) is also part of the mechanism for tightening the the flat belt. When you open the cover it releases the belt tension so you can change speeds. I believe you may be correct, that belt cover belongs with the 825 headstock since the 825 was a cabinet model with the drive below.

Personally the disassembled machine is much easier to move but it may scare away some buyers.
 
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