- If you have a new /used Gaggia or one you bought used, plan ahead:
get a 5 mm T handle hex wrench
take the top off your machine 2 or 4 screws. Unplugged and COLD!
One at a time, remove the 4 hex socket head bolts holding the boiler (aluminum) top half to the brewhead.
Apply some Permatex 81343 anti-sieze compound to the threads on the bolt.
Replace and tighten securely. Do this for all 4 bolts.
This will save you HUGE amounts of time and effort if and when the boiler to brewhead interface starts to leak. (As soon as leakage starts, the bolts will begin to corrode in place.
You can avoid teardown, drilling, heating and a LOT of nasty effort needed to remove corroded bolts from the brass brewhead.
-- The Pros.