Ronstan Series 50 Fiddle Becket Sailing Block

The Ronstan Series 50 Fiddle Becket Sailing Block is designed for compact fine-tune purchases used on mainsheets, cunninghams, backstays, and similar controls. Its staggered fiddle layout reduces the overall stack height compared with two equal-size sheaves, which can be helpful where clearance is tight. The integrated becket provides a secure point for the standing end of the purchase without adding another separate fitting. Ronstan's all-purpose construction makes the block suitable for both cruising installations and frequently adjusted racing controls.

The sheaves are self-lubricating Acetal, supported by a Grade 316 stainless-steel load strap for corrosion resistance. Fiber-reinforced nylon cheeks handle impact and UV exposure while keeping the block lighter than a comparable all-metal design. A Captive Lock universal head lets the block articulate while keeping the attachment controlled. The combination favors durability and low maintenance, which is useful in fine-tune systems that may stay rigged for long periods.

• Compact fiddle arrangement for multi-part purchases
• Integrated becket for the standing end
• Self-lubricating Acetal sheaves
• Captive Lock universal head

When setting up the tackle, leave enough space for the fiddle block to articulate without the smaller and larger sheaves being pulled out of alignment. The becket, line, and attachment point should all be selected for the load carried by the complete purchase. Rinse the sheave grooves and head fitting after salt exposure and inspect the line where it changes direction through the block. For additional fiddle blocks, beckets, and sail-control hardware, browse more Sailing Hardware.