Lewmar 50mm Synchro Fiddle Block – Becket, Black, 1/4”–3/8” Line
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You have 30 days to request a return. All sale items are final sale.
Two-Sheave Performance with a Built-In Anchor Point
The Lewmar 50mm Synchro Fiddle Block with Becket combines the smooth, multi-part line handling of a fiddle configuration with a fixed becket attachment point — giving you everything you need to anchor a purchase system in a single, compact block. The high-density, free-spin plain bearing and self-aligning swivel head keep friction low under load, while the patented shackle post lock makes rigging fast and tool-free.
Stainless steel straps and glass-fibre reinforced cheeks deliver lasting durability without adding unnecessary weight to your rig.
Compatible Applications
- Mainsheet and vang purchase systems requiring a fixed anchor point
- Cunningham and outhaul systems on dinghies and small keelboats
- Running rigging where a two-sheave block with becket is needed
- Multi-part control line systems on performance sailboats
- Line sizes: 1/4” to 3/8” (6–8mm)
- Block size: 50mm sheave diameter
Product Details
- Configuration: Fiddle (double sheave, staggered) with becket
- Sheave diameter: 50mm
- Line range: 1/4”–3/8” (6–8mm)
- Color: Black
- Bearing: High-density free-spin plain bearing
- Head: Self-aligning swivel
- Construction: Stainless steel straps, glass-fibre reinforced cheeks
- Attachment: Patented shackle post lock
- SKU: 239-29925034
Parts Desk Insights
Best Use Case: The fiddle-with-becket is the anchor block in a purchase system — the becket gives you the fixed attachment point to build mechanical advantage, while the fiddle sheaves handle the working and standing parts of the line. It’s the ideal lower block in a 2:1 or 3:1 mainsheet or vang system on dinghies and small keelboats in the 16–26 ft range. If you also need a cam lock-off, step up to the Fiddle with Cam & Becket.
Other 50mm Synchro Blocks
- 50mm Synchro Block – Single, Black
- 50mm Synchro Block – Double, Black
- 50mm Synchro Block – Triple, Black
- 50mm Synchro Block – Double with Becket, Black
- 50mm Synchro Block – Single with Becket & Cam, Black
- 50mm Synchro Block – Triple with Becket & Cam, Black
- 50mm Synchro Halyard Block, Black
- 50mm Synchro Fiddle Block, Black
- 50mm Synchro Block – Fiddle with Cam, Black
- 50mm Synchro Fiddle Block – Cam & Becket, Black
Other Synchro Block Sizes
- 60mm Synchro Blocks – 5/16”–3/8” Line
- 72mm Synchro Blocks – 3/8”–1/2” Line
- 90mm Synchro Blocks – 1/2”–9/16” Line
Pair It With
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.