Here is one way to make scale removable surfaces. Rudder ,elev ailerons.
To start with you need HLH805 flex cable pushrod from Hobby Lobby. I will be using just the outer plastic tube 1/8 in dia. 1/32 music wire or welding rod. and some 1/8 printed circut board or 1/8 ply.
After I make the stab and elev I sheet the bottom of the stab leaving about 1/4 in overhang to seal the gap for the elev. This gives me a guide to center the elev and hinges. I cut my hinges from pc board or 1/8 ply<Not light ply> then drill a 1/16 th hole through hinge.
On the elev . I am working with an elev that is 3/4 thick. cut off the leading edge of the elev 3/4 in. Now make 1leading edge 3/8 thick with a 1/8 in grove down the middle. I do this with my table saw. It can be done with an exacto knife. Most elev and rudders are tappered, so I make the leading edge a constant width and a little oversized. after the grove is cut<this is for the plastic tube that will go all the way accross the elev> glue it to the elev with the grove fasing out. Next glue another leading edge to the one with the tube installed,Round the leading edge. The plastis tube should be in the center of the circle. Next on my band saw I cut a 3/16 gruve in the leading edge where I want my hinges. Cut through the plastic tube. Now install the hinge into the leading edge of the elev, put the rod down through the tube , through all hinges. TYhey should move free . next cut a slot in the trailing edge of the stab to match where your hinges go. I place the hinges where they will fit up agaist a rib to glue to. You should do this before cutting the slots in the elev.
With the hinges on the elev slide them into the stab slots you have cut. Use clamps to hold the hinge to the ribs, center the elev in the stab , making sure it moves enough for your travel deflection. sand til you get what you need. When you are happy with the fit glue hinges to the ribs. Pull the rod out and sheet the top of the stab .
I put a U bend in the end of the wire and push it in and glue it to the end of the elev when I am finished. T o remove the elev simplly pull the rod out. This will tahe some time to do on you first one. But it comes in real handy building a warbird. How many times do you have to put them on and off to get everything right. I would suggest trying this on something that has a constant width elev to begin with. If you have ? just ask. Rich