I have always used medium viscosity Super Glue on the backs of my 3-D eyes. I just dip a spinnerbait wire or paper clip into the glue, and place a VERY small amount, not even a drop, into the eye recession, and then I use the very tip of an exact-o knife, slide it under the eye then set it into the recession. press down gently with the OTHER end of the Exact-O knife and wa-la. You will knock all the paint off the jig (I powder coat and bake) long before the eyes come off!!