I've recently installed a new CB master cylinder on my IIA. Could someone give me more information on the process of getting the correct 1.5mm freeplay on the master cylinder piston via pushrod adjustment? I'm not really sure how this is measured, and I cannot detect by feel when the pushrod is actually making contact with the piston. I've gotten the pedal height adjusted correctly and would like to ensure this other adjustment is correct prior to buttoning everything back up and filling with fluid. Thanks!