Bail springs are the round semicircle wire that surrounds spinning reels. When the bail is up, the spool is exposed and the line able to cast out. Flip the bail spring down and tension gets added to the line, allowing for a handle-turned retrieve. Because the wire is exposed on the spinning reel, bail springs are prone to damage. When you experience a damaged bail spring, replace it with a new one to get the reel back to working order.
Cut off the fishing line at the spool on the reel. Unscrew any reel housing caps on the front center of the reel.
Unscrew the spool screw on the sides of the reel. Pull out on the head and spool to expose the bail screws.
Insert the tip of the screwdriver into the bail spring retaining screw. Pop the bail spring out of the housing and pinch the opposite side of the bail to pop the entire unit out of the reel.
Pinch the new bail spring and fix the end tabs into the housings (where you removed the old bail). Screw the single spring bail retaining screw into the reel, securing the bail spring in position.
Place the head and spool back into position and screw the head cap onto the reel. Run the fishing line up and through the rod line guides.