I actually use nothing now... I use to and i found in the end that it wasnt from my cores not being straight i was actually stretching my decore to much... Im not saying you are and the last thing we all want is someone to beat the same tune in your head when your frustrated. Just next time when you decore and your not sure on your stretch then understretch it. I use absolutely nothing now and its perfect everytime as long as i dont second guess myself when stretching "just a little more..." understretch that shit buddy. Everytime my cores collapse its because i stretched it to much come to find out.
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You bring up a very good point that I failed to mention earlier about how important the prep work is to making things successful (and easier) with these more advanced builds. Again, I haven't worked with any swivel system before, so, this tip that I use is for the old school freehanders, and it's extremely basic but equally as important...taping the ends. I use FrogTape, but you could just as easily use masking tape or painters tape.
I cut a thin strip across the width of the roll
Lay my three cores down in place as perfectly parallel as possible
Then, I personally find it much better to FOLD the tape over and under multiple times rather than rolling
The last step, I take a pair of pliers and apply even pressure and firm, but not so tight that the cores slide or move any at all, then I squish it a bit with my thumb and forefinger
This helps assure that (when freehanding), closing the chuck tight using the flat part of the chuck doesn't cause the cores to shift...this is how I start my wraps until I'm far enough away from the chuck to be able to use my grip with the steadying finger and remove and center the core wires in the chuck to finish the claptoning
You're not drinking water are you?! You realize that stuff is found in antifreeze!?!