I fixed our gas oven a few weekends ago by replacing this Oscillation Overthruster.

Whirlpool gas safety valve and regulator assembly

What would have been a $400 repair ended up costing about $90 and one hour of a Saturday afternoon.

I was tempted to call this gizmo (really, a “gas safety valve and regulator assembly”) a flux capacitor, but honestly, which film would you rather see again?