Pdestal mount newbie...E7's on 68 302

Have a 68 Mustang and recently bought some Thumper ported E7's with pedestlal mounts from someone who went a different route.
I've researched the archives on adjusting them with shims but why does it seem opposite to me?
The instructions read:

"Turn the pedestal bolt by hand (no wrench) until the bolt is snug and the pushrod is seated in the lifter. Next, put the torque wrench on the bolt and slowly turn until it clicks. The wrench should turn between 1/2 and 1 turn. If it turns more than that you need to add a shim. (Shims are available in a kit for about $10.) If it turns less than that you need longer pushrods."

It seems so opposite to me, if you have to "turn more than 1/2 to 1 turn"
I would think you would need a longer pushrod to pick up the slack. If you turn less then this then a shim would be in order.
Help me to understand..
Thanks,
Drew
68 Mustang

Hearne,
Did you stick with the pedestal on your E7's?

Thanks guys!!
I'll stick with the pedestals since I have a set of nice new Crane roller rockers that came with the heads. I understand the concept of the preload with the turns now....The "longer pushrod needed with the less than 1/4 turn" threw me off, but I get it now.
Drew