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I have been able to find really small rubber bands (circumference about the size of my pinky finger) leftover from my braces. I used these to hold the foam in place before wrapping the rubber tape around the chopstick (step 2). But be sure not to stretch the foam. Make a little foam bulb. Pic 1. Then wrap the rubber self-adhesive tape over the rubber band and the edge of the foam. Pic 2. Stretch the end of the tape a little for best results. It takes about 24-hours for the tape to cure. Pic 3. Before that adjustments may be made easily. Good luck!
I ordered: https://www.amazon.com/gp/product/B000PDKYXU/ref=o...But *any* low density conductive foam will work. For just the tips of the chopstick, I used 1.5" x 1.5". But if you add a pencil (cap) eraser onto the thicker end of the chopstick -- to make a heavy-duty stylus -- a slightly longer piece is needed. Try 2.5" x 1.5".
The rubber (tape) that's used (in Step 2) to hold the conductive foam on the end of the stylus is rubber *self-adhesive* tape. The one I used is made by 3M and was near (regular adhesive) electrical tape section. The main difference is that this self-adhesive tape only sticks to itself instead of everything else! Remember to stretch this tape as you wind it around -- back onto itself.
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