Do, don't know it. The only ones I know you can do is the lube and
polish. I heard you could take an appropriately sized machine screw,
heat it up and screw it into the hubs and it would cut/melt threads in
the hubs that you could load with graphite, but I don't think that one
is legal.

I've seen about beveling the tread so a smaller portion touches the
track or only running with 3 wheels touching, but that's about all I've
seen.

Let me know what it is?

Tillman