Originally Posted by
Bianchigirll
Despite the promise of truly custom sets I don't think I ever saw any single cogs except for a few Dura Ace ones, very early on in the HG/UG cassette era
"Cog boards" predate cassettes by quite a bit. "Back in the day", every well equipped bike shop had a Sun Tour, a Shimano and the good ones, a Campy cog board that was a large board with pegs and the outlines of evey cog size and configuration they offered. You bought them individually to bulid a custom freewheel or to replace specific worn cogs on your existing freewheel.