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Great project, It is a project the is in the possible for many if us. Interesting, productive, affordable and not time consuming. Also no special tools. but as a little note the larger the diameter of the can the more weight the faster cutting, commercial rock polishers use drums ove 4" in diameter with hundred of pounds of stones. also consider get some of the abrasive used in vibration polishers,they are harder and keep cutting better. Some sands ma not be any harder than the glass.
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