I will be installing a new distributor on my 9N. I have Old Hokie's jig but I am somewhat confused with the timing adjustment. I set the point gap to .015. I have read to leave the two point hold down screws loose during the timing adjustment.That's what has me wondering. I thought you secure the points after setting the gap and then loosen the big screw accessed from the side to move the advance mechanism just so that the points begin to open, then tighten up that screw. I use on ohm meter w/ audible to indicate when the points just open. Am I doing this correctly?