I got the best results by closing them all the way down, backing off each one 8 clicks and putting them umber the unit. Then one at a time see of any of them slide out easily because they are not tall enough to make solid contact with the unit. If so, slide that one out and raise it one click at a time until it is when you slide it back in under the unit is has grip and is supporting the load like the other feet. I found it was usually 1 or 2 footers that needed that adjustment.Are there any instructions for this? I'm going to give a set a try in pretty short order here.