I saw the hex screw and went 2 out of 3 rounds with it before I gave up. I removed the uni-pods and looked in the bore while pulling the slides up. Wiggled the needle and could tell that it came up thru that hole where the allen goes.
BUT it was sooooo tight, and I've recenty learned an expensive lesson on brute force.
I'll try again. The needles were raised after some engine mods. Perhaps theres some locktite blue in there?

Thank you Random Guy,
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