those wont work because there are bearings in them
but the easyer/ cheaper way is to make it a 1 wheel drive kart
go look at northerntool.com
thats were i got alot of my stuff
including my pipe bender, tires sprokets and hubs, throttle grips and alot of other stuff
its a nice place
It should be keyed on both sides, all the live axles i have sene are stepped for a nut to hold the hubs on.
Well verify your paypal.