It is much easier than you think and allows for micro adjustments to ensure the SUM clamps properly. I have taken a photo showing the 2 separate screws on each clamp that you adjust
Look at the picture ( If you open the pic and stretch it you can see the sizes in mm of the drivers) you will see 2 Allen key 1/4 inch drivers attached to the 2 separate screws
First locate the alien screws the small one is 1.5 mm and is on the end of the body of the Sum parallel with the scope/barrel. This screw is the “ clamping screw to do any adjustments you must first undue this one turn
The second Allen screw is 2 mm it is located on the inside face of the clamp, again I have left a 1/4 drive Allen driver attached
Process
First open both the clamps to expose the mechanism
Second, undo a single turn ( anti clockwise) the small 1.5 mm screw situated in a hole at the end of the SUM body
Third, you can now adjust the clamping force by adjusting the larger 2 mm screw shown on the clamp inside body. This is adjusted in degrees of turn so you are only turning it 1/4-1/2 a turn, when you wind it anti clockwise it increases the clamping force and decreases it clockwise. It’s trial and error
When you have adjusted the 2 mm screw to the clamp force you require you then do up the “ locking” 1.5 screw
You then repeat the process on the other clamp. In short the small 1.5 screw simply locks the adjustment in place, the 2 mm screw adjusts the clamping force, you have to undo the lock screw first the you can adjust the clamping force, then lock the 1.5 mm screw up. Any problems come back to me