Paul, my Adept 2 seems different again in that it has two sets of holes:
small link arm, holes at 2.75" & 0.8",
Operating arm, holes at 4.425" and 3.5"
The first holes quoted are the ones in use and give a ram stroke of 6.25".
Obviously the second two would give a shorter stroke but not used or measured it.
From centre of pivot pin in small link arm to end of the operating arm is 19.75"
Hope this helps,
Chris
PS – just to clarify the 0.8" hole in the small link arm would give an effective link arm length of approx 2", down from approx 2.75" sounds obvious I know but could have been misconstrued! All measurements are approx,, measured over the pins/bolts etc.
Edited By ChrisH on 06/02/2021 11:07:45