mounting nylint wheels on clod axles?

[trailmaster]

was wondering if any body had any tricks to getting these wheels to fit i get the concept of just removing the blck hub peice and useing the brass hex but the clod hex i to big to fit ! i found 2 brass hexs i a bag of clod parts that fit perfect but they look a bit different than the ones on my clod instead of looking like a flat brass nut they have shoulder on one side like i said they fit perfect problem is i only have 2 and i dont what they are from to try and gett 2 more any ideas did clods come with differrent hex sizes at one point in time???????? thanks for any info!