Threaded freewheel adapter for 1/2" shaft

[Chalo]

I asked this question a few days ago in the rack-mounted drivetrain room to no avail, so here goes:

Who knows where to find a threaded freewheel adapter for a 1/2" shaft?

I have a nice Bison 18.75:1 gearbox with a 1/2" input shaft. I'd like to use bicycle freewheels or track sprockets for their light weight, easy availability, low cost, and common required tools.

Thanks for your help.

Chalo

 

[loquin]

check Staton - Dave stocks lots of different adapters.