do you have any experience of these and are they any good?

Real Bottom Brackets

Link doesn’t work…not seen those before though, could be OK, for £18 why not try it?

I wonder what the spring does ?

corrected the linky.

i think charlie bikemonger used to sell them.

I had an early Hope BB of similar construction (1998 I think) which only lasted weeks 🙁 Many frames allow water into that area which would then get into the bearings.