comments:
foxjohnc87 posted on r/mechanicadvice2d
If you do, have them reproduced in steel for much higher durability. However, it appears that you can pick up some new ones for $65 on Amazon, which would be far cheaper than reproducing them. In the past, I was able to solve the stripping issue on a similar cart by drilling the axle and hub to accept a roll pin to keep it from wearing out the splines.