I noticed that when I close my version of the 18-24 model, the two outer rollers come together and actually touch each other, which is part of what makes it work. However, the link makes the distance between the other two rollers a bit farther apart.

I basically just shortened the existing link so when it's assembled, the two outer rollers are practically touching the inner roller with just a tiny gap, so when you close it, all of the rollers are virtually the same distance from each other.

Otherwise, I love this design. It worked well even before I made this change, and you can just close it and stand it up on its end to save a little workbench space. [thumbs up emoji]