When installing the insert in the block, I left approximately .020 inches above the top of block to hide the line where the insert wall met the trem block wall. I carefully pened the edge of the repair insert and here began the process of milling the additional material flush with the top of the block. The dial indicator and plate gauge allowed me to check the relationship between the insert and the block while avoiding cutting into the block even the slightest bit.

When the milling was complete, approximately .0005" remained above the original top surface of the block.