How do you summon ancient gear golem?

Ancient gear golem is easiest summoned using geartown which allows you to summon ancient gear monsters with one less tribute, ergo, you only need one monster to tribute to summon ancient gear golem. Ancient gear golem cannot be special summoned which make things difficult. Cards such as spell gear and ultimate ancient gear golem can special summon ancient gear golem from the deck and hand, or graveyard, respectively, but they require much more cost.