What do I do with this during SR suntour lower leg service?
[Based on the exploded diagram it looks like each side of the fork is a little different:



Side 1 ("air side" composed of parts 5a, 5b, and 5c) looks most like your picture.
Side 2 (composed of parts 3a and 3b)looks most like what you were expecting.

This video at 2:17 shows a fork end that matches the picture in the question


You'd use a wrench on that side rather than an allen wrench.