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Sharpen a carbide tipped masonry bit like you would a normal drill. Drill fairly slow.... I've drilled 6"+ thick hardened tool steel with a masonry bit and an air gun for cooling, many many times. Carbide doesn't like the shock of cooling intermittently with water, so unless you can keep it...

My rationale is that a 4 post isn't lagged to the floor and most come with castors. Jacks are available for lifting the front or rear and you can store two cars on top of each other when the lift isn't needed for service...