Unfortunately, no. I too have pondered that. My thought would be to start by carefully drilling a hole in the location of the rudder post with a .080 drill bit and very carefully open this out. Next, take a very small diameter piece of aluminium rod (brass might work but i'm not sure) and make sure it will plug into the hole you drilled in the rudder. Next, whack part of it with a hammer to flatten it out, and cut it to proper length. Then, file it to final taper and shape and cross section with sanding sticks and flexi files.
Added bonus to this approach is you can leave the mast off until the very end of construction. Rodney Williams used this technique on a 32nd scale Hellcat and i was pretty impressed.
What do you think?
david