Testing the Backrail Fit:
With action fully assembled, keybed clean, spring out, cheekblocks bedded, and glidebolts off keybed, reach through dampers, strings, and action parts with a long screwdriver (or other device), rest tip on backrail cloth, and tap. If there is a gap in the fit, a high-pitched tap should answer back. Try 2-3 places in each section.
