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sorry for my absence on this one... just to clear a couple of things up, the threads aren't load bearing, they just keep the cap in place to seal the top of the actuator.. any load would be from the Trim Tab, up through the actuator and on to the bracket, in effect squeezing the cap between the main body of the actuator anf the transom mounting bracket... it's when there's no load that the leak potential in to the actuator is apparent i.e. that's when I need the nuts to hold the cap in place.
Regarding the comment of water ingress in to the boat itself, that's nothing more than there being a hole in the hull for the lead to go through.. just need to fill it with marine sealent once the jobs complete.
In shourt, I am more than comfortable in using Spotty D's method in this instance.
btw, thanks again for those that have taken the time to explain the imperial thread sizes.
http://www.ybw.com/forums/showthread.php?t=312088 it's something I wrote to document stripping down the actuator, the first photo should make it clear what the nuts are there for... do remember that when underway the pressure is upwards pushing the three components together rather than pulling them apart.. besides, if the nut were to fail the outcome is nothing more than a flappy Trim Tab so not life threatening..
Recieved this email from Lenco tonight and the nuts arrived earlier today:
The size is #8-32. I hope this is helpful.
Senior Customer Service
4700 SE Municipal Ct., Stuart, FL 34997
772.288.2662 ext 110 / 772.288.2566 fax
thanks again for your advice, looks like it's helped me get hold of the correct sized nuts ready for fitment tomorrow evening
Arthurs Chandlery in Gosport seem to have every thread known to man including UNF and UNC, as well as metric cycle and imperial and whitworth.Almost certainly they will be able to sort you out!
Def: Yachting - a way of spending the kids inheritance