Change the roll pins at the wheels for something solid and put the cvd pins in with two grub screws and heat shrink tube round them, make sure they are greased and check them now and again.
The pins are a bit smaller than other makes and need checking a little more regular but if you do the above no more problems.
I was pissed when mine came loose and the roll pins broke early on but now i have no trouble with them, it only costs a couple of quid for some heat shrink and solid pins for the wheels.
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