If you want to rough it up I would think that a palm sander with some 69 or less grit would do the job fairly easily and not get too carried away with removal.
I have been using the inside portions of old leather work boots. Since I wear the high top ones I usually get about a foot or so easily from each one. Course I usually end up with one here and in the truck and in the country, basically everywhere I would need one except where I happen to be at the time. LOL
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LAter,
41mag
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