Horizontal Tail Fin
When you set this up it must be at the correct angles.  Everything is by the book with the exception that they don't tell you at what angle to drill the holes for the rivets in tailboom and backing plate.  You use six rivets here and need to space them so that three are on top and three are on the bottom of the fin
with the fin set in place at the proper angle.

What your looking for here is the fin to fit between the rivets leaving some room in the event you end up tilting the fin up or down when you begin flying your ship.  If you get them in at the wrong angle and position they will rub on the fin causing you to have to remove some of the inside edge of the fin for clearance, not a bad thing if you haven't painted yet but if you have it will hurt your feelings for sure.

A  lesson we learned here is when drilling your holes for your nutplates be sure to double check your drill bit sizes lol, on the pilots side I used a 1/8 bit instead of the 3/32 bit I should have used.  Not a big deal but none the less it shouldn't have happened.  I later repeated this mistake while installing the caps in the tail rotor blades.  There it was a biggie so be careful and check twice and then check again before drilling anything.

A note here on the after market electric drive for adjusting this fin in flight, in chatting with builders and owners it is felt that if you were trimmed for fast forward flight and a situation arose that put you in an auto and you didn't have someway to put this back to the factory position fast it could cause you to crash the ship.  I can't remember the whole thing but it's something to do with the ship wanting to come down tail first or nose first so be sure to research this item before taking the plunge literally.  I saw a ship with one installed at Homer's and judging from the length of the slots in the flanges that allowed it to rotate it takes less than 3/8 inch travel for full range so even slightly out of sink must have quite an affect on the ship.

Winglets

When we bonded these together the resin took forever to harden, seven days in the sun in fact.  I got ahold of the local resin guru here in town and he told me it was because the resin was too old, seems this stuff has a 30 day shelf life, (that's 30 days after it leaves the resin factory's mixing pot, not 30 days after you open the can), and if it's older than that it will still harden but will be radical in that it will take longer and require more catalyst.  Best thing to do is buy your resin in small quantities as you need it and that shouldn't happen to you.

Another note

is don't mix it in wax coated containers or the wax will mix into the resin and cause problems.  There's a Bondo that's lighter you should use instead of the older regular automotive type.  It sands and adheres to the surface just as well, it's just lighter and of course more costly.  I never could get the mix of this stuff right, every time I mixed it I only got to use about a quarter of what I mixed before it began to set up.....good luck lol.