Three main reasons
water is mainly added to stop chipping and breaking.
water will add days if not weeks to this process
the weight of the water will off balance the tumbler too much when it's over sped. (think of an unbalanced washer on spin)
another small reason is, adding water and smashed up components together and mixing them "could" create gases. In this case it might be ok but i can't say that for sure, they already have a funky smell when you tap them with a hammer.
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