AMuzi wrote:

3-spline sprockets are cheap and ubiquitous.
They're 'quick change' in that the previous
versions (mostly prewar) were all screw-on
track sprockets. Standard format fits
Sturmey, Shimano, SRAM-Sachs-F&S-Torpedo,
Bendix, Durex, Centrix, and so on right down
to $5 chinese child's coaster hubs. You can
mix-n-match across brands and tooth count,
change your gearing every morning if you
like, sizes range 13t to 24t.

Another thing I have thought about doing is to
flip the sprocket which has an inclination and
is facing inwards by design/default, but
flipping it might be better than padding with
spacers/washers to get a better chain line, if
indeed it can be done without complications as
I suspect it can?

--
underground experts united
http://user.it.uu.se/~embe8573