Lewmar 50mm Synchro Fiddle Block – Cam & Becket, Black, 1/4”–3/8” Line
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Maximum Control in a Single Block
The Lewmar 50mm Synchro Fiddle Block with Cam and Becket packs the most functionality into the smallest footprint in the Synchro 50mm lineup. The fiddle configuration gives you two sheaves in a staggered arrangement for smooth multi-part line handling, the integrated cam cleat locks off the line instantly without a separate fitting, and the becket provides a fixed anchor point for building purchase systems — all in one compact, lightweight unit.
The high-density, free-spin plain bearing and self-aligning swivel head keep friction low under load, while stainless steel straps and glass-fibre reinforced cheeks deliver the durability performance sailors demand.
Compatible Applications
- Mainsheet systems requiring integrated cam lock-off and purchase anchor point
- Vang and cunningham purchase systems on dinghies and small keelboats
- Control lines where space is limited and multi-function hardware is preferred
- Running rigging on performance dinghies and day sailors
- Line sizes: 1/4” to 3/8” (6–8mm)
- Block size: 50mm sheave diameter
Product Details
- Configuration: Fiddle (double sheave, staggered) with cam cleat and 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: 239-29925039BK
Parts Desk Insights
Best Use Case: This is the all-in-one solution for dinghy and small keelboat sailors who want a complete mainsheet or vang system in a single block. The fiddle layout handles the multi-part purchase, the cam cleat locks off the line hands-free, and the becket anchors the system — eliminating the need for separate cleats or additional hardware. Ideal for boats in the 16–26 ft range running 1/4”–3/8” line where simplicity and weight savings matter most.
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 Block – Fiddle with Becket, Black
- 50mm Synchro Block – Fiddle with Cam, 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.