Some problems I’ve noticed with the two Unior’s rear derailleur hanger alignment tools (Hanger Genie 1602/5 and the 1602/2 tool).
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If you've found any errors or lacking information in the video(s) - please let me know by commenting on the BikeGremlin forum.
You can comment anonymously (by registering with any name/nickname), but I think it is good to publicly document all the video additions (and especially corrections) - even if their author chooses to remain anonymous.