Eventually, you may want to get these neat tools:


I use these all the time, as you may have noticed already that many pre-slotted parts are too tight, too short, in the wrong place or add some extra slots. I refuse to dig and gouge at the slot with a slitting knife so here’s the ultimate tool:
http://www.greatplanes.com/accys/gpmr4010.html
Get some spare blades for it, practice on a piece of scrap balsa.
Don’t force it or get the blades hot, let it cool.

This guide works OK too:
http://www.greathobbies.com/producti...od_id=GPMR4013



This is optional, but I like to use this saw with a Dremel tool and router attachment to get the slot started perfectly instead of the above guide. This is mandatory if you need to replace a blown CA hinge in the same spot as before. Keep the speed as low as you can.
http://www.hobbylinc.com/htm/gyr/gyr8211015.htm

http://www.hobbylinc.com/htm/dre/dre565.htm