I have a set in my olds the middle nut there is a jam nut loosen it and u can make your adjustments as needed. I had never used those and I've had the boat out a number of times w no problems although after my third run I pulled my cover s to check on them they were still as tight as I left them hope that helps

Loosen the jam nut and extend till it is in the rocker pushrod socket u should have free movement in a rotating fashion with a slight drag no movement at all up and down.