I’m gonna check out the Rule-sheet at Tilt Forums.
Edit: pasted from there below
Destruction Jackpot:
After each Multiball played (and after collecting 5 Tail Whips), the Destruction Jackpot will be ready at the building shot. Shoot the building, and the Magna-Grab post will hold the ball then drop it to the upper flipper after about 10 seconds. Shoot the loop to collect the Destruction Jackpot, and raise the multiplier for the next Destruction Jackpot collected in a game. A brief grace period is given to collect the Destruction Jackpot if you miss the initial loop shot.
The Destruction Jackpot value = the base value x jackpot multipler.
Base Value: Starts at 3,500,000, and increases by up to 20% of the points scored during Multiball. The base value resets at the end of every ball.
Jackpot Multiplier: Starts at 1X. Add +1X for each successfully collected Destruction Jackpot.
A lit Destruction Jackpot and the Jackpot Multiplier seem to carryover after draining but the Base Value will reset.