How to fit a round peg in a square hole
Can you fit a square peg in a round hole so that no light shines through? No.
But you can fit a round peg in a square hole. Here’s how.
Lets say the hole is 2cm by 2cm square.
You need a round peg (or dowel) 2cm diameter.
Cut it 2cm long.
Turn it sideways and slip it into the hole. Perfect!