Genuine Shimano Slide Plate Spring (part #10DR0), also cross-referenced as TGT2577. This OEM slide plate spring is used in Shimano Tiagra, Trinidad, and Torium series conventional reels. It provides the tension needed to keep the slide plate properly seated and engaged within the reel frame, ensuring smooth and reliable free-spool and drag engagement during use. A critical small spring for maintaining proper reel function. Available from Offshore Tackle & Repair in Stuart, FL — your Treasure Coast headquarters for genuine Shimano reel parts and professional service.