Operate the bolt smartly. There is no spring. The action depends on the rifleman using the bolt with determination.
BS. They have a leaf spring. The sure fire fix is to modify it to a coil spring. I've done this numerous times after the leaf spring broke. Here's what the upgraded coil spring ejector looks like:
To the OP: I would NOT buy a factory replacement leaf spring ejector. If you plan on using your rifle, modify your existing ejector to accept the coil spring or buy one like shown in the pic from Numrich or possibly ebay. I've seen them listed there too. Good luck with it..