I installed robart hinge points into my mustang when I cracked a CA hinge. 2 of the 4 hinges needed to be drilled thru the old CA hinges. No problem but buy the Robarts drill jig for the hinges and use a new sharp bit and go very slowly. I would say you need the drill jig as even with the jig if you push too hard you can feel the drill bit wanting to drill either up or down of the old CA. Go slow and let the drill bit cut the old CA hinge material. I just cut the old hinge flat with the wood and drilled for the robart. I used pacer hinge glue, wet a Q-tip with some water and moisten the hole before putting the glue in. Melt some Vaseline and dip just the knuckle of the robart hinge and work it a little. You will have a very smooth operating elevator after that. If the elevator halves are in the right place vertically then mark both sides of the gap with a marking pen so the holes line up perfect. Keep in mind that the drill jig is 2 inches wide so don't mark your holes too close to the edge as you won't be able to get the jig into it. After drilling I use a cone shaped deburring tool and round out the end of the hole for the knuckle. Works great and it goes really quick. You might never use CA hinges again. Good luck.

http://www3.towerhobbies.com/cgi-bin...&I=LXET65&P=SM Hinge drill jig

http://www3.towerhobbies.com/cgi-bin...&I=LXET77&P=SM Something like this for the opening up the hole for the hinge knuckle.

http://www3.towerhobbies.com/cgi-bin...?&I=LXCX67&P=7 hinge glue, comes with a needle applicator, just wash out with water right after use. Be careful to not put too
much, if the hole is into the interior of the surface the glue will enter it, although a iron will make the dry glue
disappear.