Originally Posted by corruptbiggins
You should still have the spanner after you used it at the top of the muzzler.
You are right, I played the episode again (that will teach me to save now and then) and after i used the spanner at the top, I still had it.
The spanner disappears in the moment, when digger has already dug the hole and is back up and THEN gromit tries to give him the spanner. Diger doesn't move back down as he should... this bug is reproducable.
And unfortunately the game didn't allow me to take another fortune cookie, but now it worked.