You can start a non-RoG world with more Clockworks creatures (change the preset), more rocks and any good stuff you want, remove anything else you want, add more beefalos and more pigs, when you start, look for a group of Clockwork Rooks and Clockwork Knights, and try to make the Rook charge the Knight, it will destroy it, just dodge the Rook and loot the gears! You can even easily find gears around the world since sometimes pigs succeed in killing Clockwork creatures^^