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@fizzy.bleach
Thanks. 17t is too small for me but I'd appreciate some info on the clickster anyway cos I might get one. It's really hard to explain but if you imagine the whole thing as basically a ring of metal with thread on the inside (kind of like a nut).
OK, well a nut has the same internal diameter going all the way up its middle so you can screw it onto a bolt (for example) and keep screwing till the bolt completely passes through the nut (stay with me).
Some freewheels have a lip on one side of the inner threaded hole which would prevent them being screwed on after a certain distance, because the lip would block the threads on the hub from going any further.
My hubs won't work with freewheels that have that lip. Shimano ones do, Dicta ones don't. As far as I can tell, WI ones do but it's extremely hard to see from pictures.
That's a sad attempt to draw what I mean. If I screw the hub all the way in, it hits the lip and locks the freewheel.