Ronstan Series 55 Fiddle Becket Ratchet Orbit Block

The Ronstan Series 55 Fiddle Becket Ratchet Orbit Block combines a practical attachment layout with the load-handling needed for high-load sheet handling where a fiddle layout, becket, and ratchet action can reduce the effort needed to hold line. The ratchet can be used in automatic or manual mode, giving the sailor a choice between load-sensing engagement and deliberate on/off control. Its configuration is suited to sail-control systems where smooth line movement and reliable hardware matter. That makes it a practical choice for both replacement work and new rigging layouts.

The Series 55 ratchet sheave is anodized aluminum, with a machined gripping profile that helps the crew hold load while still allowing controlled easing. High-compression Acetal ball bearings support the rotating sheave, and toughened glass-fiber reinforced nylon forms the surrounding frame. A UV-stabilized SK75 Dyneema link provides a light attachment option without relying on a bulky conventional head fitting. The ratchet system can be used in automatic or manual mode on compatible Series 55 configurations, letting the sailor choose how the holding assistance engages.

• Up to 20:1 holding power
• Smooth easing of sheets
• Automatic ratchet block

Orient the ratchet so its gripping direction helps the crew during the loaded part of the sheet cycle rather than fighting the desired easing direction. The becket and fiddle geometry should be reeved as a complete purchase, with enough articulation at the soft attachment to keep the sheaves square to the load. Check the ratchet action, Dyneema link, and rope groove regularly if the block is used in a heavily worked mainsheet system. For more ratchet blocks, beckets, and sheet-handling hardware, browse more Sailing Hardware.