Cheers for the welcome guys! Yeh the idea of straightening the axle did occur to me today... I'm just concerned as to what effect it may have on the strength of the member. I guess it's not going to be under a huge ammount of load tho so I'm probably just being paranoid!

But yeh, having read a post or two on here from a while back about the effects of altering PTO pully sizes on the rest of the driveline and reading of gearboxs being trashed within a few nanoseconds, I am starting to think that cool as it would be, the 21 horse might be a little too much clout to be putting through a 35 year old gearbox... might go for something around the 13-15hp mark instead... at least until and if I can be bothered with engineering some kind of way to put a later Rancher transaxle in.
Oh I forgot to mention, I am also restoring a Series 7 8/30 Victa which will become my backyard beast when I move into urbania in a few weeks. it's currently got an 8HP I/C in it but I'm probably going to repower it with a 4hr old 12HP Tecumseh motor that my old man got years ago to put in a Rancher we had that threw a rod.Obviously I'll have to do some wiring up for an electric starter, but no big deal... while I'm at it I will probably modify the bonnet to accomodate some headlights too!
Anyway, I will definitely post up a project thread shortly for that one, which is the current timewaster!

Cheers!