Created a counterweight for my valve index. It uses 5 stacks of 15 pennies for approx. 200 grams. I used a couple velcro cable straps to attach it to the back of the headset. The difference is immediately noticeable. Much more comfortable. I recreated it after printing, to close the back. There is enough space for 15 pennies and a cap in each tube, I couldn't find my CA glue so used elmers glue, works for now.