I just got and IRS axle for my Rev3. It's the large ring with 12 balls. It seems that the balls are very close to the edge of the rings. I'm using a Kimbourgh Spur. Is there a different spur that would get the balls closer in to the axle and in the middle of the rings more? I looks like the diff would get dirty pretty fast the way it is set up right now. Thanks for any info.