I have bought just about ever saw I can think of to cut holes in a finished dh....with little success (however, the ones I have tried are thicker, older houses). The vibrations are terrible and what a mess ....I have tried little hand saws, Proxxon jig saws, regular jig saws, etc. It has been my nemesis! Forget using a box cutter knife (tried that too). If you find a solution, let us know. ps MDF is very very hard to cut.