10R8A (RD21051 Main Shaft Assembly)

Genuine Shimano Main Shaft Assembly (part #10R8A) — the main shaft is the central spindle that supports the spool and allows it to oscillate during line retrieval. A bent or worn main shaft causes spool wobble, uneven line lay, and can lead to drag inconsistencies. Cross-references with Shimano part number RD21051. OEM replacement ensures perfect fit and factory performance. Available from Offshore Tackle & Repair in Stuart, FL — your trusted source for genuine Shimano reel parts.