Geoff writes: << So, today's questions are... : Is that felt punching the same as a thin balance rail felt punching? If not, what do I use? >> That punching is not woven cloth, if I remember correctly. It is felt, and a set of arch punches can make 88 of them out scrap felt pretty quickly. The dimension needs to allow the screw to , ideally, sit in mid thread when the mortise is flush with the top of the jack. Good luck, it ought to take no more than a couple of hours to cut, clean, and glue the new ones in Ed Foote RPT http://www.uk-piano.org/edfoote/index.html www.uk-piano.org/edfoote/well_tempered_piano.html
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