Recently I did some seat maintenance on my ’66. I noticed when my seats were redone, specifically the seat bottoms, the upholsterer used nylon strings attached to backside of the upholstery, threaded through the buns to “pull the seat covers down” for shape and attachment to the seat springs. It struck me as odd as I would have thought this would have been done with hog rings. 
Seats look good but nonetheless is this “par for the course”?.....was this the way it was done at the factory?

Seats look good but nonetheless is this “par for the course”?.....was this the way it was done at the factory?
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