Probably the easiest way to get things right wit 2 piece bases. https://www.24hourcampfire.com/ubbt.../tps-basebed-alignment-tool-arrived#Post

The only deviation from TPS's instructions is, I would use JB Weld ( much stronger), instead of 5 minute epoxy supplied with the kit and use headless base screws for the bedding process, holding the the alignment tool/bases on the receiver with loops of surgical tubing or large rubber bands. RJ