[Fishjack]

Fellowship - A little late but FWIW –

I have lost at least three trim tabs on my OX-66 250 Yam. In the past I had always just guessed at what was "tight" on the tab bolt. After I lost the last one I decided to check the torque specs in the Yamaha service manual - the spec is 42Nm (31 ft lb). I broke out the torque wrench tightened the last one to spec and have not lost it yet...

I know that on the one’s I lost I was not applying nearly enough torque just by guessing. Might be worth a try..