10SM7  (RD18993  Idle Gear B (Small)

Genuine Shimano Idle Gear B - Small (part #10SM7) — this smaller idle gear is part of the dual-gear oscillation system in Shimano spinning reels, working with the larger idle gear to produce smooth, even spool travel during line retrieval. Worn or damaged idle gear teeth cause uneven line lay, clicking sounds, and rough oscillation. Cross-references with Shimano part number RD18993. OEM replacement ensures precise tooth engagement and quiet operation. Available from Offshore Tackle & Repair in Stuart, FL — your trusted source for genuine Shimano spinning reel parts.