If you search out the posts here on AOMCI you will find a bunch of discussions on sealing cork floats. [some I posted myself] Some say it can be done easily, some say “not so easy” , some say you do not need to , some blame ethonol gas. Anyway, with the 18-7208 float modified to fit there is no question on sealing it. I have also used them in Evinrude Sportsman outboards and am very pleased, this motor with the brass screw in the float had me wondering, but I think raplacing the screw, with the hairpin type clip is a good idea. Thanks Again