If you haven't bought/installed your new starter...don't! Not just yet, as your old starter just needs a set of copper contacts. $30 at the stealer, or @ $5 a pair at your local auto electric shop. The Toyota starter is way better than the aftermarket ones available for $125 at the auto parts store.

Remove the three screws holding the trapezoidal plate, and check out the contacts; one side will be worn way down, and it'll take you all of 10 minutes to replace them (do both sides).  You can sand off where the plunger touches the contacts...good as new. Make sure to use RTV to reseal the plate.

Even if you've used the new one, repair and hang on to the Toyota starter for a spare...you'll need it.