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I've always wondered...
Does anyone here ever use a power buffer -- the sort used to buff oxidation out of automotive paint? This device is similar to a sander, but uses a chamois or much less abrasive material than sandpaper, so it would remove hoof wall in finer increments than a sander -- somwhat like buffing your fingernails with a power tool. Obviously, caution would still be needed, but it seems a bit safer than a sander.