the ball is still needed but stays on the climbing line and does not need to be messed with
Ok..........I thought your new addition was the release mecahism in the end of the Rope guide!
Is that the original ball?
What size hole did you drill to place that on the rope?
That would work fine. Why dont you just wrap some tape around where the ball is, causing a bulge big enough for the rope to fit through the rope guide pulley and catch on the retrieval clip. Keeps it simple! Good to see development though