If you're shopping for 105 (BB-5500), make absolutely sure that you're getting the v1, not the v2 with longer splines. Shimano tried to cover up their cock up by reissuing it after fixing the problem with the first generation Octalink without changing the part number.
Ah, thanks once again tester. I hadn't realised that tech doc was one of their usual exploded diagrams!
Think I'll return it then, I heard some people at Manchester use either the 7700 or the cheaper 105 version with the seals removed.