I have my front engine mount of my 74 Commando sitting vertical in the vice with all shims removed as per the manual. What I am unsure of is how to measure the clearance.If it just sits freely it measures 40 thou. But the cap at the bottom nearest the vice has some up/down play. So if I hold the mount and press down to get rid of that play, the measurement is 65 thou. Which measurement should I use? I am guessing that I need to get rid of that play in the bottom cap, to get a true measure.