I take a length of paracord, tie a small loop in one end with an overhand knot, and a large loop in the other end with the same overhand knot. The palomar knot is tied with the braid to connect to the small loop. This acts as a stopper so theres no need for swivels or stoppers. The only caveat is you cant use paracord that is too thin or thick for the knot to pass through the DR pulley. I use 2mm paracord and it slips through seamlessly and never fails to trigger the autostop. At the other end of the paracord is a larger loop knot, with the loop being large enough to feed through the eye of the DR ball, and then loop back around the ball for attachment. Finned balls are best for this setup to minimize the amount of rotations the cannonball does underwater. You dojnt weant your braid twisting freely the whole time you troll. I use 15lb round balls with fins. You can use the bigger loop knot as a stopper for your release clip so it wont slide up the paracord.
The length of paracord you choose will depend how far your booms are extended and how low you want your ball to hang off the pulley once the autostop is triggered. I start with about a 9' length, tie the top loop and then size up the bottom loop and trim the excess. I have mine set up so the ball is at the surface, so once it autostops i can swing the arm in and lift the ball into the boat by grabbing the paracord, or if im fishing solo I leave the arm out and just hit the up button to take the ball out of the water completely.
Hopefully that makes sense!