💬 Re: Rudder Hatch.
"so that i dose not suddenly part company from the rest of the boat."
Coupla small neodymium magnets should fix that Martin.
I used 5mm round ones to hold the cabin roof on my Sea Scout.
Pretty sure that Rob and Sy also use them, amongst others.
Or, since it's on the stern, you could use the Filler caps (got mine from Krick Riva fittings range), like I used on my Sea Scout to fix down the hatch over my rudder servo.
I drilled and tapped them for 3mm, inserted 3mm studs (cut from bolts😉), and epoxy glued 3mm nuts into recesses in the flange.
Forward edge is held down with two 5mm diam. magnets.
I also put a very thin layer of silicon round the flanges.
No leaks, even with a prolonged 'reverse gear' test 😀
Magic woodwork for 'Plastic Man' 👍👍👍
Cheers, Doug 😎