Ok. Has you know Larry Scott focused is bis workout on the preacher curl bench. So here is one of his routine all the steps are one set and yeah if you do this workout twice a week you will understand why the first Mr O liked it so much.
Step 1 Reverse grip scott curl 1x6 with max weight till failure
Step 2 same bar same weight do another set till failure of normal grip scott curl and without rest...
Step 3 grab a pair of dumbells who match the same weight of the bar and do scott hammer curls, go till failure with some burn reps all out.
Step 4 rest 2 minutes and repeat twice more.
You might feel the need to decrease the weight a bit after each set and that's normal, make sure you go all the way down and stop on top right before losing contraction with your wrists cocked all the time.
It's called mechanical advantage extended set because it goes from the hardest exercise which is the reverse and finish with scott hammers which are the easiest and allows to use more weight on normal conditions, once you try this you will be instantly hooked right after the first set, it will be forearms and bis pumped like never before. Needless to say that you have to warm-up properly. In a month twice a week you will have nice results.
This principles can be applied to other bodypart as well in case someone is wondering about it.