@arkailija @TuffDong seems like another tool for our DIY list! Jar lifter and some preparation + testing and we should be able to build a strong jelqing tool for less than $20 (like) because it will be DIY we would also be in control to adjust the force of the device if we attach other springs to the rolls (stronger or less intense).
The most sick jelqing construction would be a round circle construction instead of 2 rolls, so we're jelqing the most possible volume of our dick in the same time. But well, that's some futuristic stuff (cwl)