Thanks Nurse Julie,
Thanks for confirming what I thought. I have not come accross it specifically mentioned by Honda manual but felt that it should be the case in normal engineering practise.
I did see some "pinching" of the circumference on one seal where the 2 halves of the casing join, which led me to think that it had been fitted "clamped".
I am in the process of doing the internal measurement and inspection of components at the moment and will be in touch with you later. Thanks.
Regards
Dennis