Thanks for all the advice.
I managed to use a mates downrigger for the job.
First attempt left me spewing, applied heaps of pressure & wound onto reel off downrigger, only to find, close to the end & near exhaustion the line had a bad taper towards the top of spool!
Had to wind all the line off spool, add 2 washers & re do it a few days later.
Anyway, finally got it on evenly and to my surprise 550m PE6 80lb.