Using a Washer and a Pencil… Been using this tip for a few years now for small scribes such as this MDF top for a small cupboard going up to a curved wall etc… Keep a selection of washers handy in your toolbox, preferably with lots of variation from thin to thick ‘penny’ washers. Simply measure the front projection to ensure it’s equal, and then run a pencil inside the washer, making sure the washer is tight up to the wall all the way. The washer will follow the undulations …