MMD Archives June 2021 Contents of Digest 2021.06.06 Prev  Next Nr Subject Author 01 Popper "Stella" Reproducing Piano of 1908 Uwe Gernert 02 Acknowledging Helpful MMDers Fred Martin 03 Operators "O" Roll Tracker Bar Scale Nicholas Simons 04 3D Printing of Piano Roll Spool Flanges Marshall Jose 05 FS: SB-series "O" Rolls Stephen Bentley