[tadol]

I’d score around the perimeter with a fresh utility knife (blade), then use a sharp chisel in the same manner as setting in a hinge - tap straight down with an even tap from a mallet or hammer to establish depth, then clean up - if you want to go so far, see it]f you can find a Stanley #271 mini router plane to make sure your depth is even, but thats probably overkill -

https://youtu.be/diy-cX_sDZo

http://www.hansbrunnertools.com/Stan...nley%20271.htm