HiHi Adam, thanks for the reply. Correct, no hub - bearings sit in the wheel. I don't suppose you have a pic of your retaining washer in situ do you? Does the OTK use 17mm stub axles/bearings too?
Adam is referring to a full sized kart, whereas you're on a cadet yes?
We have run them to the locknut before but generally left at least a 5mm spacer in there and looked at camber/castor/ride height/ ackermann / using hubs to tune the front end.