I use these hinges as well. I use a toothpick and spread a thin coat of Vaseline on the hinge knuckle. I then fill the hole with Aeropoxy or Hysol and spread a thin coat on the barbed end. After inserting the hinge point, I make sure it is appropiately positioned and then tape the surface in place. It takes at least 24 hours for a good strong setup, but I assure you they will not fail, or never have on my planes. The Aeropoxy or Hysol is some strong stuff.
Tommy