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Normally anytime I've hired a tool that has a consumable bit/ blade (core saws, con saws etc.) they just charge you for how much of the consumable you've used when you return it... might be worth checking if there isn't some miscommunication here and you don't actually need to buy the grinding blocks yourself?
Nahguavkire
The grinding blocks do bump it up a fair amount. With that said, I'm having zero luck with getting a company to get back to me, so DIY may be the option to take.