The wheels are 32mm diameter, which is fine for 10mm scale
Yeah, I got the Smiley, but Northern Finescale wheels sometimes look dreadful even in 10mm scale! For example under any bogie wagon that has its solebars roughly 3' above rail.
. . . Having shelled out a not insignificant amount of dosh (given my socio-economic disadvantage*) to replace some NFS wheels with Slaters, I tackled NFS about it. Apparently the 32mm diameter was a mis-interpretation of tread-taper by their toolmaker in Canada. So far, nobody has cared enough for NFS to remake the mould.
. . . If they are serious about 1/32, they really do need a new wheel mould - 32mm wheels scale out at 3/ 4 1/2" which, for an unworn 3' 1" wagon wheel, is a whopping 19% over- scale by area - and it's area that counts visually.
About the tapered axles - The steel axle is notched off-centre. The tapered muff is injection-moulded around the steel, the notch locking it in place. Then the wheels are pressed onto the journals and cemented to the tapered muff.
. . . To dismantle NFS wheelsets, wrap one journal in thin card, and grip it lightly in a stout vice. Then hit the end of the other journal smartly with a hammer, to break the key. The steel slides out, and the three plastic parts then come apart with varying degrees of grace - the cemented joint between wheel and taper being the most fractious.
Then you can either re-purpose the muff or the wheels, depending on your predilection.
By no means all wagon axles are tapered, but anyone who's desperate for them in 1/32 can simply turn them from plastic, either with hand tools or by setting up the top-slide. But if enough non-turners come along, maybe moulded ones could find a market.
. . . Naturally there'll be Battle Royal between those who want them 3mm bore and those who want 1/8"
David 1/2d
* disabled working class pensioner on Benefit - until Austerity diverted my benefit to the Wunch of Bankers