[Kevan]

Proxies nearly always require wheel inserts if you're using plain alloys, here's what I do...

• Don't throw plastic wheels away, one day they'll be useful
  

   

• I chopped an old axle shorter to fit in my dremel type grinder
  

   

• Push a wheel onto the knurled axle as square as you can so it runs true...it'll hold well enough
  

   

• Grind the wheel down to size on a big bastard file (that's their real name - honest)
  

   

• Grind it down to just fit inside your alloy wheel...you may find a lot of the wheel will disappear as you grind it really thinly
  

   

• Cut the front face of the insert with a razor saw, it's easier to do this whilst it's spinning in the dremel machine but run it slowly or it'll fly off into hiding
  

   

• Try the first one so you have the right thickness, you can cut it short but not push it into the wheel so far
  

   

• All 4 fitted and look much better than plain wheels
  

   

...and there's one nearly finished proxy car (just need to skim a few thou' off the tyres to width)