Andrew Birkett's nobugs.org
Yay, the mould is complete. I’d run out of sand again before I reached the top of the flask (uhh, the “cope”). But it’s close enough.
A quick wiggle of the metal rod, and it came out cleanly, leaving the hole which you can see at the bottom right.
Now for the moment of truth. Will the two parts of the mould come apart cleanly?