When the soft top is pulled up out of the storage compartment, the springs hold the rear of the soft top in position so the rear of the top moves past the cover hinges and the back of the storage compartment.
If the springs are not attached to the soft top, the rear of the top will move toward the back of the compartment as soon as the front of the top is lifted. The rear end of the top will not move past the hinges and the front of the top will stop and not move up more than a foot or so. With no springs, the soft top cannot be lifted out of the compartment by pulling up the front of the top.
If the springs are not on the soft top, to get the top out you must reach behind and under the soft top with one hand lifting and holding the back end of the top tight against the rest of the top guiding it past the hinges while pulling up the front of the top with the other hand.
The "two hand lift", one under the rear and the other pulling up the front, is quite awkward and not much fun when trying to get the top up in a sudden rain shower. Having the springs on the top allows the one hand, easy lift.
Richard M, NYC