I don’t have a lot of experience with these but keeping the carb
from running over has been a real challenge for me. Picking up
a couple carburetors to use as a replacement, witness marks
from beating on side of the carburetor seem to indicate that this
is not an uncommon problem. I second polishing the needle
and seat.
Making a float – I would suggest Mumbles recommendation.
If the float is out of round or the float pin isn’t centered it may
cause the pin to lean against the hole in the cover restricting
its up & down movement. That’s my thinking anyway.
Tubs.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.