Not real sure what you're asking, but if you mean the nut that holds the arm on to the drive spindle at its base, mine is sort of a strange acorn nut. More cover, but the top of the nut is solid. Make sense?
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2015 Legacy SR340 360RB with 2014 Wrangler Unlimited Toad
Gigi, Poppy and Sadie the Jack Russell (all 14 lbs of her)
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!