Last year I installed Bair axle and wheel assemblies on my ASV RC100. This week I did a 250 hour service which includes greasing the axle assemblies. The easiest way is to put the machine on a flat bed trailer with an operator you trust to move the machine. Of the four idler axles three had the circular grease fitting guard deformed to the point that a grease gun fitting would not go on. The point is that the guards need to be a thicker wall for better protection. I am thinking 1" schedule 80 pipe. I will probably run them until they need to be rebuilt and modify at that time. Out of 14 grease fitting only 2 were broken. The stock fittings take a 10MM socket to remove but a standard 1/8 inch NPT with a 7/16 inch hex replaces them.