When I worked for a retailer 2 summer's ago, GT had a plant in MX. The govt reportedly made them MOVE (something about govt. owns a lot of the commercial buildings or some drama) so in mid-summer, gearing up for the pre-fall runs, they had to pack up all the machinery and move to another location! then the saga continued that they'd not pre-ordered enough carbon cloth to make the arrows...and it was being used up in the "war effort."
Point was they had zero inventory in the pipeline for the fall. We had zip. And our parent company was a huge US archery distributor!
I wondered if they cut corners to catch up or otherwise have QC issues. Vendors have said they'd not heard anything negative back, but a few batches in the pipeline, and with the breadth of membership here on Gang, you can bet we'll hear about it.
I still have 3 doz 5575 in the pack from a few years back. I've got 2 bows tuned to them.
Working at the shop, I'd not heard folks having trouble w/ anything but weight change from the trads to black in the same spine range...but that was prior to the fiasco above.
:( Sad to hear of this. They are/were/can be very decent shafts!
Since every carbon I know is wrapped around a mandril, whether parallel or tapers as some, there are start stop areas of overlap.
That is what I've been told cause the "high spot" and some mfg. recommend finding that spot and using that for the cock feather so it's at the same consistent position. Once "tuned" and everyone oriented the same, the theory...
is that it will consistently behave the same and not effect accuracy.
now my head hurts...that is everything I ever learned! :D