A Poor Man's Rope Guide

This is a "rope guide" or retrievable false crotch. The arborists doubled 1/2" line (orange) goes up through the halyard shackle, through the ART pulley, and down to the carabiner on the arborists harness. The rope guide is constructed of two aluminum rings spliced onto 8 1/2' of arbormaster (red, white black), and a prusik of 12" dyneema girth hitched to a small aluminum ring (gold). The pulley is attached via a Petzl dogbone, and the retriever is attached via Black Diamond Dynex.
Notice how she is retrieving the line now. The little red ball measures at 9/16" + and it will pass through the pulley but get stuck in the halyard shackle.
pulling through the pulley...
and apply pressure and it pulls the pulley through the ring and the whole assembly drops to the ground. In other words, with this assembly you don't need an actual crotch, but you can just use the stem.