As hosted by the fixed gear gallery:

Sram 3 speed hub converted to 2 speed fix'd (20mb pdf)

Would be great for the hills round here, anyone converted one of these?

I dunno about those but I know a few people with converted sturmey archers. If I remember right, you can't skid on them.

sheldon's got a diagram here:

https://sheldonbrown.com/awfixed.html

that's for sturmey archer. never tried it, but i think it's kind of complicated, and you sacrifice some performance

According to the pdf, converting the AW is a huge hassle and doesn't work as well as a Sram conversion.

You can convert bendix as well, some guy has one or two of them on FGG.

no, but i think i will one of these days

i've never been lied to by a pdf before.

It hardly seems to be some great commercial venture. pdf's are known to be truthful to a fault.

if you want 2 why not just get 10?

because it's possible to make a fixed-gear 2 speed, but impossible to make a fixed-gear 10 speed (at least with the amounts of money anybody's willing to spend on the problem)...