Quoted from TheNoTrashCougar:
The Anti-gravity Device (magnasave) works in a really cool old school way on this game. You charge the anti-gravity device using the captive ball (Flooble Crank Post). If you need to use the magnet to save a ball from the outlane, you can tap or hold the secondary button on the right side of the cabinet. The magnet will activate for as long as you hold it and as long as you have charge left. It is 100% time to charge based. You can conserve the charge by tapping, but if you get in a bad situation, you can press and hold and attempt to gain control and drop it down the inlane. This is my personal favorite way that magnasaves are implemented and I have not seen it done like this in a while. There is no exposed core, so pressing and holding is not a guarantee that you will save the ball. I usually just tap it away from the outlane and some of the time, it will flip back up and over the sling back into play.
Sorry for the lengthy responses.
best kind of magna save!