It would be nice if the axle fit through the bearing tightly, but it does not. Integy makes only the 4mm adaptor for this setup station, which they claim is the industry standard, at least that is what they told me. Only my TC5 has the 4mm wheel nuts, so I need to buy or have someone make 8/32 for the other cars that I have.

the setup they have for the attachment is not industry standard. not in the least. if i had know it was like it is i would have bought a different brand. trying to save a little. but it does fit my f1 car also. i had to make an adapter/spacer to fit the front axles. but its nice to be able to mount it up and make adjustments on the f1 car now.

not the industry standard
 

I agree, like I said that is what Integy told me when I placed a service ticket on their website about not having an 8/32 adaptor for this station.

I currently have a service ticket at the Integy website asking about buying an additional set of 4mm adaptors. After doing some research I am going to drop that idea because there is not enough material in the 4mm adaptor to tap it to 8/32 thread

I know the tool and die maker pretty well, and I believe he can make an 8/32 adaptor for me, which will make the station worth much more than it is now