Hi Didier,
There are no mounting clamps that come with the thrust tube , I made up those bracket from scrap aluminium right angle channel I had lying around
Its fairly simple you have to push the thrust tube in and then place your turbine on the rails and eyeball it from the rear to check if your turbine is centered in the vertical axis
Adjust the tailpipe from the front to the correct height and drill holes for the bracket. the 2 brackets screw on to the rear former.
Similarly adjust the turbine in the lateral axis until it is centered and mark holes for the mounting with a pin vise or similar tool.
Xantos