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I created this pulley to increase the tail ratio of the T-REX 500X from its stock 3.72:1 to 4.95:1.
In order to use this, you must cut the stock ALIGN tail boom by 11.5mm using a pipe cutter. It installs exactly the same way as the stock one. After many test flights I've confirmed that it's good for production so here it is.
With the shortened boom, it easily fits 477mm VTX mains and 80mm SAB tails. It will also fit 480mm blades.
It will likely discolor very quickly once you start flying with it. This is normal and is nothing to worry about.