BTW, having had a spline flange (bolts to the wheel) ruined by dirt/grit getting past a (probably 30+ year old) broken o-ring and mixing with the grease (think grinding compound), I now recommend replacing the o-rings every couple of tire changes. I bought them in bulk on eBay, probably a lifetime supply of both sizes for about $10....
And if you loosen the 3 nuts on the Final Drive every time you have the wheel of and tighten in the following order everything will be lined up and your splines will be much less likely to wear prematurely:
1) Axle nit
2) Axle pinch bolt
3) 3 nuts on Final Drive