I have a very old 9" sb, (1935 + -),that when releasing the clutch knob, you have to make about a 1/2 turn to disengage the feed. You also nearly have to push the knob in while disengaging. I recently bought a newer version 9" sb, (1949 + -) that barely has to move 1/8 turn to disengage the feed. Can the older version be adjusted, or is that just what you got at that time. Thanks, Jim.