Pushrod Length - Lifter Preload

Soon to me in the mail I have the Comp Cam adjustable rod checker, how do you guys setup checking the correct push rod length on a Hydraulic Flat tappet setup with roller rockers....

I for one have read a ton till my face turned blue, but I figured I'd ask the HAMB...

Preload then check ?

Or zero lash and then check the markings on the tops of the valve tips ?

Whats your procedure

 

WHAT? Planet earth calling....................

 

The earth is full go home

 

That's why your in Canada !

 

I made up a solid lifter at zero lash height to check lenght on a roller cam
set-up.