J/42 Mainsheet turning blocks

[Todd Stevens]

Another measurement I forgot to take before leaving the boat for the summer:

Anyone have the block size and back plate dimensions of the cheek blocks that lead the mainsheet to the winches? I want to buy locking blocks to replace these, to free up the lazy winch for potential alternate spinnaker controls.  

Somehow I doubt that I'll be able to match the bolt pattern, but it would be nice.  

Sale ends today at West Marine.  And I have an embarrassing amount of bonus bucks built up.

Thnx,

Todd

J/42 S/V Wild

[Rod Deyo]

The turning blocks on hull #61 are Harken 75mm Black Magic foot blocks that have a lockoff lever. They're still available when last checked.

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Rod Deyo

[Todd Stevens]

Well, maybe that was a bit of a dumb question. Based on line size, the best matches seem to be the 72 mm Lewmar, or more likely, a Harken product not listed at West Marine.  

[Todd Stevens]

Thanks Rod.  Message went to my spam folder for some reaon.

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[Todd Stevens]

Hmm… Harken offers three choices. Well… five.

“Element” blocks for about $200 a pair.  Oh, these are listed under “costal / day cruising” well Pfffft on that. 60mm only.

“ESP cruising” blocks for about $500 a pair.  Same working loads as “Element” though. 57mm or 75mm

“Black Magic” for about $1100 a pair. Up to twice the working load.  Twice the wallet pain. 57mm or 75mm.

Looks like either the 57mm or the 75mm would be in spec for my 1/2” mainsheet. But will the lockoff on the 75’s grip a 1/2” line?  It’s spec’d for 3/4”...

Only the ESP 75mm are on sale today (save $100 on a pair.) 

Looks like the “Element” blocks come in left- or right-handed lockoff, but the others don’t.  Just flip them over for left-hand use?

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[Chris Campbell]

I replaced the original 75mm blocks on my J/44 with new Black Magic ones. The lockoff can be moved. To install the block you take it apart, install, and reassemble - when you reassemble you can put the lockoff on either side, as you prefer. My mainsheet is 1/2" and the lockoff seems to work pretty well, so far - can't say how much I trust it yet, but it hasn't let go in a few uses.

[Rod Deyo]

The lockoff on the 75mm BlackMagic works fine with 11 mm braids for the main halyard. 

Rod Deyo

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Rod Deyo

[Rod Deyo]

Correction - the it works fine with 3/8" and 11 mm braids for the main sheet.

Rod Deyo

[Rod Deyo]

Checked our records instead of guessing. We've used Marlow 10 mm D2 (our current main sheet), Samson 3/8" Warpspeed, and an 1/2" braid (probably Samson XLS)  for the main sheet over the years. The 75 mm BlackMagic foot block lockoff arm workd fine with all of them. And yes, you flip the arm for the proper orientation.

Rod Deyo

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Rod Deyo

Rod Deyo

[Todd Stevens]

Thanks. This is all great info.

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