During the late 80s and early 90s, I traveled to Sao Paulo several times on business. I enjoyed your country very much. The people were helpful and friendly and I certainly enjoyed the food.
Hi ku4qb 1,
Welcome back to the hobby.
Check out godshalls live steam locomotives and parts for all model bolts/nuts and other items.
www.martinmodel.com for casting sets, flywheels, etc.
Do you have a wrench that fits the square on the tap? You might be able to turn the tap a bit at a time. It would be slow, but might work.
If you don't have a wrench, you could put a slot that flits the square in a thin piece of steel.