I left this a while ago as there seemed to be no way to make it happen other than to have your hands WAY ahead at impact. I've come back to it because I was not getting consistent 'low' trajectory on short irons and wedges. Having a more flexed wrist ('raised wrist bone') at impact was the hey to getting the trajectory I wanted.
I could do this at the range when I was careful to go slow and on partial shots. However it felt as though I had a separate action to take with my lead wrist to make this happen.
The 'trick' from my last post was to 'use' the resistance to extension of my trail arm. If you assume 'Keystone' your focus is probably on keeping your lead wrist flat while you exert pressure against your extended lead arm by pulling your trail elbow into you midsection. You need to be careful to insure your trail wrist doesn't 'cup' (become extended) but it is also possible to have your wrist go the other way under this pressure - 'bow' or 'raised wrist bone'.
As I extend my lead arm down and through from '6/100s' against my resisting/retaining trail arm, I am 'biased' to allow my wrist to 'bow'. I encourage this in my 'waggle' by retaining the 'Claw' and pressing the clubhead down to impact position with my lead hand/wrist/arm (ala Golden drill) against the retention. I try to reproduce this trail arm retention/lead arm extension tension in my real swing so that it forces my lead wrist to 'bow'.
