RE: What spinner for Hacker C50?
Hello Malcolm.
ES somposites do a series in fiberglass, but they have nothing between 80 and 92mm.
3.5"=88.9mm.
Nexus Modelling Supplies do a 3-1/2" nylon spinner for £3.75. I would guess companies like Dubro make 3.5" spinners in plastic.
Maybe not your style, but probably more than good enough at 6000 rpm.
Magne