I'm attempting to refurbish a bike that I was given, it has a (not sure what brand) coaster brake, which according to sheldon brown's site has a peculiar kind of cone nut. The wheel might be 10 years old, it's hard to say.
I've been able to remove the otherwise butchered nuts (see below) using a tap & hammer and an axle vice, now that they are free I'd like to know what they are, so that I can replace them, do they have a special name?
I've only ever seen mention of cone nuts resembling a regular washer, but with two flat sides (sorry for the poor explanation) - these that this bike is fitted with are something different, see below:
Apologies for my dodgy graphics work, the middle is threaded, and sized to fix the (slightly larger than the wheel nut thread) centre of the coaster brake axel, the outsides smooth (very much resembling a washer) except for the two grooves.
The entre part is perhaps 20mm in diameter; unfortunately my bright idea of drawing the part, and then using Google image search has failed me!
In the end, I'm sure this particular bolt is a strange european relic designed as some kind of "security" bolt; not dissimilar to the Apple style 5-point start, or similar, to discourage people against fiddling with their coaster brake. But I would really like to rebuild the brake!
I'm sure I could replace them with regular "cone nuts" - that is the ones with two flat sides, but the term "cone nut" seems to refer more to the purpose than the design of the nut itself.
All information appreciated, thanks in advance!