Okay - yes, to return the tongs in time, it's a bit tricky. We've made it a bit easier now - but in the entrance screen, you have to go to the left off the screen - I've included a picture to show you how.
If you click on the screen where the red arrow is, you go off to the left, to the stores. If you click anywhere to the south (the blue line) it takes you to Prospero's House.)
(We've now added a grassy knoll to separate the paths to make it easier - this one got by us for the demo! Sorry!)
You keep going to the left, past the shops and off the screen to the left. You arrive back at the Blacksmith - and you can replace to tongs. You have to do this before you give the pole to Brattle.
Good luck!
Bt