I agree. IMO, a free-wheeling pulley would be a perfect example of an allowed modification performing an illegal function... you've changed function from that of a drive pulley to an idler pulley, for which there is no allowance. I would argue the same logic applies to a "restricted" hose.
And one of my pet peeves - we really need to stop using the word "free" - it does not exist in the ITCS and so far as I can tell, never has.
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