Thank you for the tips Dave
Now the rudder frame. The plan calls for two wood screws supplied. This is pretty naff unless sealing over them rendering it fixed.
I want mine removable for future servicing
Here I cut the treaded part off two servo rod horn connectors (2mm thread) . I poured thick CA in the holes and stirred it around the sides and bottom of the drilled holes with a piece of wire . Then inserted with a screw and more CA and removed the screws before complete set.
The rudder frame made to the plan then I've lined the holes with brass tube and fitted with Araldite rapid before countersinking after dry. The brass tube is to prevent the wood crushing when the screws are tightened.
I have made it to accommodate the 50mm prop even though I'll be fitting possible a 45mm brass
Then I've given a good coat of finishing resin and re tapped the holes before set
Likewise to the frame . These will be sanded and coated again. For final fitment after paintwork I'll use silicon grease on the threads and mating surfaces.