Originally Posted by bulgie

More splined weirdness, a Gnutti:

These first appeared in the early '50s. Shown here with the special remover, not interchangeable with anyone else's. This remover isn't original; it was made by a cyclist-machinist in the UK who made a few some years (decades?) ago. Don't mount these cranks on your bike unless you have the remover.

Apologies for not cleaning them before taking the picture, I didn't notice the grunge until I looked at the pics on the big screen. They deserve a polish. Here's someone else's pic, someone who had the good sense to clean before shooting:

(ugh, couldn't he have cleaned the splines on the spindle though? Haha like I'm one to talk.)

Mark B