Yeah the problem is a bit difficult to explain but basically the new bb when tightened up on the drive side just keeps turning when pinched up, so I reckon the threads are a bit knackered my solution is to fit a threadless sealed unit. However the threads seem to be in good condition, some people have said use a liquid weld some people say threadlock and now plumbers tape. In the meantime the threadless sealed unit has arrived so I want to know if I temporarily fit it will it destroy the existing threads in the shell as it is sunny