Kart with snap rings

#1
Hey guys...I’m new to go karts. I bought a kart to be used for a fiberglass van body that I have and the axles have snap rings on the ends to hold the wheels on instead of a threaded end for a bolt. One of the snap rings keeps popping off when I test ride the kart. The recess for the ring appears to be fine, I can’t really tell if it’s worn or slightly rounded, causing the ring to easily pop out. Any ideas for a fix for this? Thanks!
 
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