Blocks work but shells need editing. The crinkle coating on the cotton was applied too hard, so I had to rub it with a Scotch-Brite pad to get it to fit the block's raceways. After all this, one of the pinch fingers went too far into the raceway so I had to smack it on the whetstone. Now it works great. For the price and for my use I can't complain.
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