Valvetrain geometry video

With shaft mounted adjustable rockers the pushrod length and how much or little the adjuster is threaded into the rocker body can affect actual valve lift. Give me cup adjusters and then a measuring pushrod to try and find maximum lift as long as there are no induced clearance problems. Adjusters as far up as possible (w/clearance) or with some arbitrary thread count exposed below the rocker doesn’t guarantee maximum valve lift. Many here know this obviously. Anyway, Sounds like geometry to me.