Satttheman, did your 1521 come with a 8mm shaft? If not did you have to special order for the 5mm shaft? If it is 8mm,, where did you get a pinion for it?

I wanna do a 1521 on 5S. I can get two 5S 5000mah packs and run them parallel for 10000mah total on 5S. That should run me hopefully an hour on my LST2.