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Mount the sintered ground plate into the lead keel 

Evidently the ultra sound is performed when the structure is new and a record is made . In future soundings are compared to this “as new “ sounding record 

Interesting , Axxom seems to be taking market share on the smaller boats  I wonder what mast builder started this company 

On large masts the mainsail track is mechanically fastened to an aluminum backing plate .  your xyacht  will most likely have a Nordic carbon spar these tracks are only epoxied to the mast…no fasteners, no backing plate….this would be a poor down conductor  Xyachts  builds to customer...

They use ultra sound to survey carbon masts, structures  when the resin fails, or disbonds ,  the ultrasound senses this  change in density of the laminate   these tools are used by specialist surveyors  I see this company on many carbon surveys  https://www.marineresults.com/survey/

I’m not a lightning specialist  I simply work on many boats and can observe “ best practice “  if you are in a region with many lightning strikes you should contact the insurance companies or a local surveyor to find out what works locally  evidently boats in fresh water are very difficult to...

From a naval architect …. “ Being an enthusiast of carbon fiber masts, I collect stories of lightning strikes on them. I have seen carbon masts turn to toast, and I have seen them survive. Those that get toasted are the ones with no lightning ground wire inside the mast. The easiest path for...

With lightning you just never know  your only choice is to use best practice and hope for the best  Many boats use brushes , many use lightning rods  what is certain is that you don’t want the lightning energy to flow down the carbon epoxy mast 

And since it’s a xyacht , with  afiberglass enclosed keel , you have no seawater exit for the lightning  energy  you should ask xyacht for a earth solution 

Every carbon mast I have worked with had a lightning conductor  ,, copper cable down the mast or the aluminum mainsail track used as a down conductor  this conductor ends at a keel bolt  at the mast head is a lighting rod  does this system work ?  This is the Million dollar question  somehow...