Because the Polar cutter including a Mirco cut, is no more working by the original design of the manufacture Polar, you are (confirm to the US law) responsible for the whole safety (concept, design and achievement). In other words, if the supplier of the Micro cut (or the person who changed the cutter) does not have for this job a correct approval confirm to the safety law and organizations inside the US (like OSHA) it is your responsibility to get a safety approval before USING this machine. I think you have in the US specialists for this (ask OSHA). This may cost you some thousand greens. If the safety specialist asks (because the approval is done today and not 10 or 20 years ago) for safety functions confirm to EN1010 (highest known law) you need a new machine. Everything you touch is your risk. So far the law.
Technical wise I would just fix the cutter if it brakes down.
Buntpapier