What do I do with this during SR suntour lower leg service? I'm trying to do a lower leg service on my fork: SR Suntour Epixon  29er 
https://www.amazon.co.uk/gp/product/B014UQDX9Y/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&amp;psc=1

I've removed the rebound dial expecting something to stick an allen key into as normal. Instead it is this:



What do I do with this? Do I need to pull the bit in the centre out so I can fit an allen key in? Or a socket wrench that unscrews the whole thing?

If anyone knows of a better service manual than the one provided with this fork, or service videos for this model please share.

Thanks
[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.