Hi Tubs
Sorry to see you have been having a hard time welding that skeg,but the finished job looks great.
My Pal had a broken off skeg and I had it repaired back in 1976 by a firm here in Auckland.
The chap who welded it, specialised in aluminium and made a perfect job after I had cut out a replacement
skeg from some sheet duralium.
I do remember him saying that it was a bit of a challenge as the gearbox was a strange alloy to him and the motor had been in saltwater.
It’s had a few knocks over the years but is still secure and looks original.
I’m only sorry that I can”t remember the method he used back in 1976. and unfortunately the firm has since vanished,
otherwise I would have rung the chap to see if he could advise me.

Monte NZ