The TO4 rotator and 1000mm bucket I purchased from Catsu Hydraulic seen to be very good quality and construction but I am disappointed that the installation video and instruction manual received are for a larger rotator unit made for a much heavier machine and consequently the rotator mentioned and highlighted in the two publications is completely different in construction and design. Hydraulic and electrical are two completely different applications. I contacted the company representative Tomy Tan and he promptly sent a video send a downloadable instruction manual, but as I mentioned, they were not useful. when i reached back out to him and explained the problem, I no longer received any further assistance, or response. There is not yet why YouTube videos showing the installation process for a TO4, so I guess I'm on my own to figure this out. Disappointing.