Thanks Nick, I will try that.
I did not notice that mark, is it the one on the small rectangular piece (with the crock material ) which is at the back of the QR system ? I definitely know it is not big quick release plate which attaches to the camera
Second doubt, where does the release knob appear after attaching the QR, is it at the top or bottom or at the sides ?
Is it possible to post a pic showing the QR attachment to the head ?
I can learn lot more of things by seeing a pic.
Should I minus 4.5mm on both A and B settings (base horizontal scale and upper arm scale respectively) ? (I think I have to on both settings, my logical thinking says

)