Well after ~$35CAN for welding, a tap, file, proper drill bit the busted piece is now fixed and the cap seals again!!!
Problem solved for now but still need to get a replacement carb.
I have measured them to be 33mm Mikuni if anyone should have a carb body and cap lying around. (The black cap was cracked apparently as well so need that too. :D)
Otherwise it's time to buy the spare carb bank.
Cheers everyone for the help.
Jody