Thanks for sharing your experience!
Having taken advantage of all the information on the issues involved with fitting-up and adjusting a #1 bolt, available from many sources, I feel that I have enough understanding of the process to undertake it.
Your advice about seeking-out an expert is undoubtedly good, but, while lacking in-depth experience with the Lee-Enfield rifles, I do qualify (by prior profession) as an expert in riflesmithing, and am reasonably confident I can carry out the work successsfully, given the needed parts.

mhb - MIke