Thanks peeps
M4tt247 - basically, i shakes its tits off once your in 3 figure speeds, i've got a new prop donut ready to fit, was going to refurb and balance both props and get my shafts checked. i would of thought it was wheel balance, but it does it regardless of wheel choice
Had all my seats and carpet out this evening, only to find one of my seat mounts has succumbed to the down stuff, pretty much. oh well, suppose i better get used to find that lol