Take off the handle then remove the side plate. The spring will be right there and the yoke is the platic piece that the pinion gear rides in. The springs are on 2 small poles on top of the yoke. The yoke is plastic and the pinion gear spins rubbing it. It wears out the plastic and becomes loose. Thats why the reel makes that sound when you hit the handle when it is free spooling. I buy all my parts from Southwest Parts there in Dallas. Shouldn't cost but a few dollars in parts. https://www.southwesternparts.com/
The first pic is what you will see when you take the side plate off. There is only one spring in this pic as this is a parts reel. This is a Chronarch but basically the same parts. The second pic is the yoke with the pinion gear in it. The third pic is the yoke. The pinion gear spins in the horseshoe part of the yoke. That will give you an idea of where the pinon gear spins and wears out the plastic.