Originally Posted by Skiddins

I assume you're talking about the two grub screws on the bulkhead mounts, not the links.

Disconnect the links so they are only attached at the bulkheads. loosen the grub screws off so the roll bar drops under it's own weight. Slowly tighten the grub screw on one side until it stops the bar dropping under it's own weight. Now back it out 1/4 turn.
Repeat for the other side.

You want the bars to be loose, but not so much that they rattle around and have lots of movement for and aft or up and down.