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J/105 Hardware Replacement

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As the boats are aging, a lot of the equipment and deck hardware needs replacement. I've read through the class rules and other resources but haven't found a clear answer to whether or not you can replace deck hardware (blocks, cleats, clutches etc. with equivalent and more modern alternatives from what was provided from the factory. Does anyone have experience with any restrictions?

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Certain hardware and rigging setups are guided by the one-design rules and regs.  As technology moves forward we find that certain items specifically lines become stronger and may not require the largest diameter in order to provide the needed strength.  That being said, your hardware must be sufficient to fill these gaps.  Turning blocks need to be of the same diameter and have the same mechanisms.  The original aft turning blocks for your spin sheets need to be the same size.  Do they need to be from the same manufacturer as it was delivered?  We have seen that some are not and that is to be expected.  Adding cam cleats or altering the ratio of tuning is not allowed.  We had some cam cleats set in our cockpit that we removed.  More so because some look at it as adding weight and some say it didn't come that way.  Clutches can change as far as manufacturers.  We did not replace ours with the originals, but they were not available and we use the same load requirement with our new ones.   To cover yourself replace with the upgraded or current model of the same size.  

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ya that's what's a bit confusing. I didn't see anywhere it says that blocks need to be same diameter and mechanisms? Can ferrules be incorporate in areas where blocks once were etc? I'm not even seeing min/max halyard and rigging sizes dimensions

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Only replace blocks with same sizes, might be different manufacturer but class rules prohibit that.  They are sized in mm's.  Replace with the same size. ie 40mm, 53mm, etc.

Ferrules can't be used, has to be a turning block.

You could use a smaller diameter spin halyard or main halyard for example,  but if the original size clutch doesn't support it then you are screwed.  Hence why we have gone to tapered halyards or just core end halyards because that part of the line will not be reaching the sheet stopper.  Saves weight and is just as strong.  

I have seen many One design boats in multiple fleets that have gear upgraded like the halyard example from above, and some that don't but they still win.  It always comes down to weight savings and along with that sometimes you have a stronger product or line.  

 

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If you have a specific question, talk to your fleet measurer.

In general, replacing equipment with "new but similar" is OK provided that it does not change the purchase or mechanical advantage. The class technical committee ultimately makes the rule interpretations for all of the fleets. Local fleets get to decide whether to adopt or defect on the rules and interpretations, but there's a pretty strong trend towards accepting class rules.

 

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