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  1. Aug 2024
    1. I came across this note and saved it for you and all other Olympia SMx users; I do not know who the author is: "Can I just say, having been in the typewriter trade since 1975, PLEASE take it from me that the Group 1 (or Group 1001) ribbon intended for Olympia, Adler, Facit and many other makes DOES NOT have eyelets !! The ribbon mechanism is designed to trip and reverse when the ribbon gets taut as one spool becomes full and the other totally empty. Someone may well have fitted an eyeletted ribbon to a Group 1 spool as a bodge to get over a sluggish or badly adjusted ribbon reverse mechanism - to give the reversing fork an extra 'nudge'. The factory did not intend the ribbon to be reversed this way." In my experience, eyelets will often slip through the reversing arms and then hang up on the vibrator. You don't have to buy eyeletless ribbons; you can just cut them off the ends of your current ribbon and reattach to the spools.
    1. The three most common typewriter spools:

      • GR1 (Group 1)

        • Used by most German machines.
        • Sometimes known as DIN 2103 or 32 755.
        • 50-54mm Diameter.
        • 5mm center hole.
        • Usually 1, 3, 4, or 6 round drive holes.
      • GR4 (Group 4)

        • Used by Olivetti and some other Italian machines.
        • Early models require a separate spool nut to fasten.
        • 50-52mm Diameter.
        • 6mm center hole.
        • 3 rectangular or half-moon drive holes.
      • GR9 (Group 9)

        • Used by most Japanese machines after 1970, Hermes, some portable models from Royal and Underwood, and Olympias made for the US market.
        • 51mm / 2" Diameter.
        • 4mm center hole.
        • Usually 1, 4, 6 or 8 round drive holes.

      via u/Koponewt