OK..here are more piccies of my Extra...this time the Horizontal Tail (HT) and Elevator (Elev)

The first should show the LHS of the HT/Elev. The Hinge pin is a No6 UNC by 3/8 " (10mm) Cap head bolt which is bored to to receive a length of music wire (approx 8"). You will see a short piece of ally K&S tube which lines the hole in the balsa endcap into which the bolt head fits. Next there is a elevator sectioned (wedge shaped) end rib into which a Blind nut has been fixed from the inner side to receive the threads. This hinge pin passes through a plastic liner (a Sullivan "Golden Rod) which is laid on the hinge line of the elev and surrounded with 3/32 balsa strips to locate it in place. All this balsa and lite ply replaces the foam core of the elev previously cut off the whole HT. The Golden Rod is capped off at the LE by a piece of balsa to form the LE of the elevator AFTER the ele has been skinned with 1/16 contest balsa. The correct radius of the elev is achieved by using a long sanding bar and "filing buttons"...more or less a washer which is the correct dia for each end of the elev (ie half the elev thickness at the tip and again at the c/l root thickness) so that you get a conical sectioned LE of the correct shape as you sand away the excess...sound difficult but it isn't really....methinks a cross section sketch of the elevator would help here.

Wow...I know we're not supposed to utter expletives on this site but I just had a premonition that my box was going to crash and it did...just a millisecond after I decided to hit the OK button and post what I'd written so far...sheeeeesh.

Anyway you can see the hinge pins next to the the elev on the third piccy. The Golden rods are essentially in 4 lenths (actually one length with three very short (1/16" long) sections cut out..as is the LE (see the slots ?) This is so that the Hinge Brackets (made from carbon sheet but may be changed to Glass sheets since carbon is a conductor ...of glitches, etc since the hinge pin moves within them) can poke through the Elev to collect each Hinge bracket as it is threaded into the Elev from its tip. The cap head bolts (screws actually!) thus screw into the blind nuts at the tip and the attached (brazed in) wires go through each hinge bracket in turn as they go in until they pick up the last hinge bracket. The Hinge brackets are not yet glued into the HT so that accounts for the slight misalignment of the Elev in Piccy 1...it will be right on the night!

On piccy 2 you can see where I've used 1/32 ply (laminated to 1/32 balsa) to make up a thickness of 1/16 which is then mated to the 1/16 sheet covering the rest of the HT. This ply then forms the "shroud" over the LE of the Elev. The HT cores have end-grain balsa blocks let into them to accept the Hinge Brackets and mounting bolts. Buried in the foam cares are also a couple of liteply "dihedral braces" just to ensure the HT halves have a continuous load path across the centreline joint

The last two piccies show the Elev Horn which I've machined from a block of Ally. Its quite long but needs to be to get down into the fuselage.. The Servo Horn will be equally as long so this length will also eliminate (relatively speaking) a lot of freeplay...The horn will be attached with 2-56 screws into tapped holes in the horn and locknuts... time for a save...

More Anon...hope you like it so far...its quite a lot of trouble but if you want it scale,,,,,,,,,(and nothing else would do for my Patty!)