I have taken my lower unit off to service it do to when i drained the lube i got half water half oil. My problem is i cant loosen the 6 flat head bolts on the bottom i have bent two big screw drivers does anyone have a qlue on how to lossen them up. Im not sure if a impact gun would do the trick but do they make screw driver bit for one. Im trying to put a new seal kit on it. Oh im sorry i got alittle 18hp jonhson. Any qlues would make me happy.