I believe so. It just doesn't have much expansion to it. To get the core through in the first place I was stumped and asked a question about, I had to use a doubled over piece of steel wire and really taper the end of the core to pull it back through. Even then, I had the free ends of the wire in the vice and it took 30 minutes of milking with gloves to get the core to pop back out into the open. If I squeeze that thick region just beneath the loop, where the lock stitching is, it might as well be like trying to squeeze a steel rod. Solid as a rock.
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