I am going to experiment with these. Do they have to be installed in the comp tubes? I see now reason why they couldn't be utilized in the rebound tubes. Same affect so my simple mind thinks.Could you not run one in the rebound tube as well as the comp tube where the piston is at ride height if more free bleed is desired?How effective are they. I just looked at a 4.0 poppet that is setup with a 2-bleed. I am guessing looking at it, its the equivalent to one of the bleeds pulled out of the piston.Don't know if this topic will take off but if you have anything to add I am looking to utilize them on my next re-valve.