Originally Posted by honculada
There should be a hole in the top of the Cockers body, behind the feed tube. This is for an allen wrench to access the hammer lug. The hammer lug is located under the hammer. This is an adjustable that can dictate the release point of the sear. To adjust the lug, remove the bolt. Keep the cocking rod attached to the hammer. This will assist you on moving the hammer so that the allen key finds it mark. Gripping the cocking rod, push, pull, and rotate as you insert the 1/8" allen wrench down the top. When the allen wrench and hammer catch, turn the wrench to adjust the lug. Clockwise will extend the lug; counter-clockwise will retract the lug.
Good answer! Couldn't have said it better.
Only thing I have to add is to work in small adjustments. Give the lug a quarter turn at most, then test, repeat as needed.
While this is more important on a pneumatic autococker (where I often do 1/8 of a turn) due to timing issues, on a pump it's still important since if you over lengthen the lug you can reach a point where it won't release at all, and then you have to remove your grip frame.