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Bolt in carbon mast

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A bolt securing a spinnaker track to the mast apparently has stripped. Should you fill, redrill and retap? (I am assuming the bolt was tapped into the carbon. ). Insert a threaded sleeve? Tap out to next largest bolt? 

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Try a threaded insert as a fill and refill will not have any fibers running through the threads.  A threaded insert also has prongs to lock it in place with the install tool.  You can get the insert and tool from mcmaster carr

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Through bolting is not possible, nor is any sort of backing plate, washer and nut, etc. The location is more than 3m from the butt of the mast. 

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Carbon has the rep of being very bad for electrolysis so keep that in mind re: any metal you use.

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Even 3m you can get a plate there, if the mast is down.  Bit of string through the hole and out the bottom.  Vacuum, hook, magnet, ways to pull string.  String through small hole in plate and knot behind it.  Pull string back into mast and plate pulled with it into position.  Some glue on plate so it sticks.  Wedge of wood behind it.  Now drill and tap in place.

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You can tap a piece of G10 tube and bond it in place. In small fasteners this will be stronger than the fastener. You will have to drill the hole bigger though, depending on location than might be a concern in a carbon mast. Another possibility is to do the backing plate trick as above but use G10 plate. Again it will be stronger than the fastener, you don't have to drill bigger, and it has no possibility of corrosion. 

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So, titanium it is!

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