I have a 1973 delata tri hul, with a 140hp merc i/0 pre alpha. I just noticed "luckily before i went to the lake" that my prop seal is leaking. I have read the merc. manual and it is not to particular on repair of the prop seal. I know I have to remove the main nut with a special tool, but can i just use a drift and a hammer. Also can i just use a slide hammer with a tree jaw to pull out the gear after i remove the nut. Lastly after I have the unit out of the lower foot then what do i do? I have never really done any internal out drive repair, only water pumps and what not, but I'm very competent. Any help?