A common problem when using to much power on Tongsheng TSDZ2 is overheating. This is a way to try to reduce and tranfer the heat to the outer casing.
Video show s how to achieve heat transfer using Headpads. 2mm thick. Adhesive on both side.
You need to clean it.
Here I show how to remove the outer casing om my Bike, a Miyata Terrarunner with electric motor.