The first two things I would think about here are heat and air.
As to heat, the twistie should be quite warm (just short of glowing or floppy) and the base disk edge even a little hotter as you apply the twistie. What could be happening is that you are just getting a cold connection, the twistie is just temporarily tacked on and when it moves away from the heat as you rotate, or moves back into the heat the next time, it is shocking off. No matter what, after you get it on there, you want to be sure it is really attached, to do this I move to a cooler part of the flame, warm it there, and then progress into hotter parts of the torch, to really make sure it doesn't shock off.
As to air, if you are incorporating air bubbles in your twisties when you make them, as you heat them to wrap them on the disks those little pockets of air pop, and fracture the twistie. When making the twistie, a single air bubble in the encasing can get pulled the entire length of the cane, which is a drag, since the whole thing is then shocky throughout.
Maybe some of this will help. Since you are trying to wrap around disks, after you make the disk, only work on reheating the outer edge to the temp you need to apply the twistie, that way your disk won't collapse and become a round bead!! Jeri
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Still selling beadstands but no more Puffy Mandrels.
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