Little Tikes Cozy Coupe "car axle nut" Questions

Car Axle popped out Hi,My kids decided to ride our little tikes coupe down the stairs! Of course the back axle popped out. I tried to hammer it back in but I stopped when I felt that I was applying to

...axle grease, replace the wheel, and re-install (the rusty old used) wheel retainers the same way I took them off: push a bit here, a nit there, rotating around until they were ALMOST flush with the ...