Records from this era (1898-1950s) had at least 2 different groove widths. If the playback stylus is thicker than the groove, the record is damaged. This is wha

Records from this era (1898-1950s) had at least 2 different groove widths. If the playback stylus is thicker than the groove, the record is damaged. This is what has prevented me from listening to my great-grandparents' collection. Every time I go to purchase 78 RPM styli, I'm dumbfounded at the options and don't know which stylus to use for each record.