Thanks for your answer, it's really very helpful.
I did think the original screws must have a wider coarser thread. The ones used looked like they were only biting on the final 5mm of the thread because they must have been…"
I have a Windsor Idea number 8, "Has an issue with neck to pot connection" is an understatement. I looks like someone tried to conectit with the completely wrong srcews. Did you work out to solve the problem and have any…"