EDIT: A solution has been found! See second post for DIY!
So I purchased the IRP V3 short shifter back in May, after watching tons of videos, and reading nothing but positive reviews. I previously had the Kartboy short shifter, and It got the job done, but the rattle absolutely killed me. I bought the IRP, due to the fact that I hadn't seen anyone complaining about it rattling. To my chagrin, it DEFINITELY rattles. Even worse than the Kartboy. I understand that it's a "racecar part" that has NVH, and my daily commute is only 7 miles, so I shouldn't be complaining, but the fact that the rattling ceases when I hold the button tells me that there's room for improvement. With that said, I sought out some solutions.
Tom, @
gearOnePerformance machined a groove into the button of the reverse lockout, assuming (logically) that the rattling was coming from the metal on metal rubbing of the button on the shifter itself, but as of this writing, hasn't had the opportunity to test it. After talking to him extensively about his process, I decided to undertake the modification myself. I pulled my button off, only to find that my particular model already had an o-ring:
However, to my eyes, it looked to be too small:
So I added a larger o-ring. No difference. Took the larger o-ring off, and carefully wrapped the button in a few layers of electrical tape, to the point where it simply would not wiggle. Again, no difference. My analysis is that it is not the button that is rattling, but the shaft of the button itself. At this point, my plan is to machine three grooves in the shaft, and add three o-rings, to see if that mitigates the issue. Failing that, I'm not sure what else to do, and I'm open to suggestions.
Will update this post with a DIY if I find a solution.