I believe they're just the standard CA hinges that most 40-60 sized aircraft come with. You simply insert the hinge and surface, get it all aligned and then put a few drops of THIN CA into it and it'll wick into the wood. I use a skewer or toothpick to drip CA down so as to not make a mess on the covering. Use 4 drops per side and you'll be golden. If you want to pin them to be sure (I never do, but I always re CA preinstalled hinges for security), just dril a small hold through and insert/CA a small dowl like the the skewer I mentioned.