Matt_
I'm "nobody" to Rob...
no, you dont want the screw driver to damage the threads.
its a split sleeve. so with the nut and clamps off you wedge the screwdriver in the slot and twist it which will open up the sleeve a little..... basically you're undoing what the clamp does...
Do we have a pic to look at? I can get one later if needed but might have one online I can find
im on my phone... so if you find a pic post it up.
we might be talking about different sleeves.... does yours lock on each side with a nut thats threaded on the tie rods? or is the nut on a clamp that goes around the sleeve?