I have a new YHM flat top riser, a thin one. Cross slot to the rear, 'clamp' to the front. The front clamp has two set screws which spread the slot interface. The typical clamp at the rear is, [horrizontal]  typical.
I should like to know tightening sequence and how far 'to go' with the two vertical set screws.
I promised myself, no set screws.  


 ETA; YHM web site had instructions. Nuthin' to it.