Sick of my creaky BB, I stopped at the bike mechanic's house on the way home on Wednesday evening. He is a retired teacher & lives at the end of my road. Having got the right qualifications, he set up his hobby into a small business offering servicing & repairs.
Neil had mentioned the possibility that the BB shell had not been properly fettled when the bike was new, when I discussed my creaky BB with him earlier.
I had stripped it at the weekend, checked that the facings were bare metal & clean, cleaned everything up & regreased it before reassembly. Yet the creaking remained.
Whilst I watched, Neil dismantled the BB & confirmed that the cups still had plenty of life left. He took out a specialist BB alignment tool, inserted the blocks into the threads and gently ground off a very little metal on each side of the BB shell, before reassembling it to the correct torque settings.
After two years of trying by myself to get the BB to stop creaking, and on its second set of BB cups, I am delighted to report that the creak has completely gone, after 20 minutes' work with the right tools, by an expert.
The next day's riding was a revelation and I found I was able to push along harder than ever without having the squeaky creak to worry about.