Parsley, I don't know if you're an actual douchebag troll, or are genuinely asking
If it's the latter I love the fact that you're not afraid to ask some really obvious, dumb questions. I think you'll go far if you're being serious. If you're not then stop reading after this sentence: you're an asshat.
Ok, I'm assuming that you've never played the puzzle/logic game Tower of Hanoi. If you had you'd be able to figure this out rather quickly. If you're putting on enough weight on one side of the bar that causes the other unloaded end to flip, how would one go about counterbalancing the weight on the heavy side BEFORE it flips? Simple, load the other side with enough weight as to counterbalance the weight on the opposite side.
I.E. put plate on side 1, then put plate on side 2. Repeat until desired weight is loaded.