At todays SAA champs, I spoke to 2 dozen or so archers, some internationals , some coaches, and one well known archer/archery retailer.
Nobody has seen a break in that part of a limb, in any make of limb.Hoyts and W&W limbs have been known to break but slightly further down the limb,maybe 3 inches down from the bolt.
So it seems at the moment that I am unique, (always knew I was

)
I would love to know what caused the break, so I can avoid doing whatever I've done.I suppose with hundreds of thousands of limbs out there, somewhere, one will break.
I did not intend casting doubts on Border or their skill and workmanship, as stated earlier their response has been fantastic.