Spihc, I wonder the same. I don't have answers as I am a beginner and just destroyed my pulleys (in another thread). I saw a 501x manual from online and the difference I saw was on my Durga, plate is glued onto a plastic piece which is held in place to the diff joints. The 501x shows a "one piece" diff joint and which the diff plate is assembled next to, no glue. Maybe the fact that the diff plate is in place allowing to spin/turn freely? I don't know.
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