DIY capping board

As hinted yesterday, I did a little DIY job today - just some bits of wood screwed together. To be able to uncap the honey without creating too much of a mess, you do it over a tub. As the honey is in frames, this can get awkward cutting and supporting and so on, so you put a board across the tub and rest the frame on that, tip it so it's over the tub and cut the caps off.
So far so good. Books suggest making a hole in the wood so you can put the lug of the frame in that, to prevent the frame from slipping while you cut (everything will be covered in honey, remember). But I don't have the tools to make circular holes in planks of wood very easily. So my idea was to screw a lid upside down to the board, which should have the same function. I didn't want the lid to be too big so I spent some minutes scanning all the glasses in the supermarket till I found this one.
French Dijon mustard.

My uncapping tub with board.