This bail arm guide is sourced from the original manufacturer for spinning reels. It is a small plastic piece located near the bail arm. The bail arm guide ensures that the line is accurately placed onto the spool during retrieval. It helps to keep the line from getting tangled or getting caught between the spool and the body of the reel...Read more. The bail arm guide should be replaced if it is damaged or worn down, as a faulty bail arm guide will cause the line to tangle or break during use. You will need to remove the rotor cover to access the bail arm guide. Locate and remove the screws that secure the arm guide in place. Gently pull off the faulty bail arm guide and place the new bail arm guide in the same position. Secure the new part using the appropriate fasteners and ensure that it is aligned correctly.