I was working in my shop yesterday ( installing a dro ) and when using a fly cutter to mill material for the mounts. I noticed that the head had gone out of tram? I set up my indicator this morning and set everything back to zero, that part is good, only trouble is when everything is re tightened ( 1 axis bolt and 3 radial nuts on studs ) with a light tap to the corner of the head casting I am back out 8-10 thou ? How much oomph should I be using when tightening the hold downs? The last thing I need is to either strip out one of the fasteners or break the casting.