Solution: Fuck it I find it my own since our Admins are busy handling some other topics.
So you people who use this Open Front Tensioner from Funssor or EarthToMe.
Try to tension by using your fingers, pull the bearing block to the tension point then tighten the Nylon Nut under the tensioner housing. Then screw in the tension bolt at front.
Try to make the bearing stack and the should bolt as vertically aligned as possible
For the front tensioner bolt is only used to changing minor tension on the belt.