Side elevation of the side-kit. Tap a button to light up a part. The CABLE button makes the cable path glow neon so you can trace it to the drum.
drive ring (the invention)drums / pulley / bracketssprings / motortube / hoistcable (toggle)
Tap CABLE to trace the cable from the tube drum → over the pulley → down to the coupling drum on the drive ring. Toggle Chain to see the alternate coupling.