In fact my problem actually is that I want to remove the last amount of felt, during first filing as during the next ones. Unless the hammers are monsters, I leave them the most of their weight and interlocking, if not enough felt remain, so much needling is due I tend toward leaving most in place and correct the tone as much as I can without intensive shaping. Isaac You said : Hi Isaac, It is no trick. Just a faster removal of felt, that is if you have the correct grit 50 or 60 and fresh paper. Then finish up with fine grit down to 240 or so.
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