Clem, I never realised that about SW5000 and SW4000... just assumed they were essentially the same bar the size. Have both Stella 5000 and Twinpower 5000 but never owned a 4000 spool. Very good information to have and thank you.
As for Trevor's point, I think a lot of us do that, especially with the higher end reels. When I think of the fish I have caught with the Twinpower SW5000 especially and the stress I have put on that poor little reel, it is no wonder the gears completely failed a few months ago!