but you have to be patient and do it carefully. Finally you have to tighten the pump down each time you move it because if its not tight, you will get an erroneous reading.."flex" of the pump will throw the reading off.. I rotate it inwards until I get absolutely no flow. Then I slowly bring it back. What helps is to get a Punch or scribe and scribe marks on the pump flange where it meets the engine flange so you can get an idea of movement.

I highly believe in this method....