Things I liked: The seal fit perfectly, The 124 is shooting better than ever, the technical help from Pyramyd concerning proper lube was correct. I am more than satisfied to have saved this fine old gun.
Things I would have changed: Because of conflicting advise on line, albeit well intended, a page or two of instruction would have been appreciated.
What others should know: For the 124, you will have to make the spring control tool. Log the steps you take, so you can accurately reassemble. I used a padded bar clamp to seat the seal, that worked for me. Good Luck