Lewmar Synchro 72mm Single Fiddle Block 29927231BK

Binnacle.com #:  19422
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Lewmar Synchro 72mm Single Fiddle Block 29927231BK

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Lewmar Synchro blocks. Unique free-spin self lubricating bearing. Swivel lock self aligning head
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Binnacle.com:   #19422
Brand:  Lewmar
MFG Part#:   29927231BK
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Lewmar 72 mm Synchro Single Fiddle Block 29927231BK

Lewmar's Synchro Blocks are engineered for speed, efficiency and superior handling.

A practical switch to change from swivelling to fixed shackle.

Lewmar uses a combination of scientifically optimized block geometry, a free-spin bearing and self-aligning head to reduce friction and increase efficiency by up to 40% over budget blocks on mainsheet systems.
Each component is perfectly synchronized with the movement of the rope, providing you with an easier, smoother transfer of power from deck to sail and less wear on your rope.
  • Stainless steel strap for improved strength and longer service life
  • Stiff glass fibre reinforced cheeks to prevent lines from wedging
  • Innovative design with “tool-free” sliding swivel locking mechanism

Plain bearing blocks are typically used for heavy and static loads in:
  • Halyard tuning
  • Mainsheet systems
  • Mast foot blocks
  • Masthead blocks
  • Boom vang
Practical switch from swivelling to fixed shackle


  • 72mm diameter sheave
  • Safe working load: 2,420 lbs.
  • Weight: 8.8oz.
  • Optimum line size: 3/8"
  • Max. line size: 1/2"
  • Post diameter: 15/32"
  • Shackle Pin: 1/4"

  Lewmar 72mm Single Fiddle Block Catalogue 2019 Edition
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Binnacle.com Shipping FAQ

Q. Do you offer Free Shipping?
A. We have free ground shipping via UPS or Canada Post within Canada on most orders of $99 or more (pre-tax).

Q. What do you mean by most orders?
A. Some items are exempt from this offer and are indicated on the product page. Exempt items are usually bulky or heavy items such as buoys. Over 98% of the items on Binnacle.com qualify for the free shipping offer.
To see what your shipping charge (if any) will be you can add the item(s) and quantities to the shopping cart and you will see a shipping cost calculator

Q. Where do you ship from?
A. We ship from Halifax, NS

Q. What is the delivery time?
A.  NS, NB, PE: 1 - 2 business days,
      ON, QC, NL: 2- 4 business days
      MB, SK, AB: 4-5 business days
      BC: 5-7 business days
When your order ships you will be emailed a tracking number which will give you the scheduled delivery date

Q. Do you offer Express Shipping?
A. Yes we can ship your order express. Please send an email and we will provide you with a quote (info@binnacle.com)

Q. Do you require a signature on delivery?
A. We sometimes add a signature requirement especially if it is a high value package

Please Note:
Very Remote areas are exempt from Free Shipping offer. These are typically remote northern areas. Nunavut as well as many parts of the Yukon and NWT are exempt from free shipping

Money Back Guarantee
Guarantee You may return your purchase to us (with a return authorization number - use this form) within 30 days and we will refund the purchase price of the product. Items which are cut to order (rope, wire etc), software, chart cards and printed materials (paper charts, books) are not returnable.

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