Review on DEWHEL Shifter Bushing Compatible Isolator by Alfred Paiz

. I was trying to install this on Revain's inexpensive JOD Quick Short Throw Shifter kit. 2002 NB2 Mazda MX-5 Miata 5MT. I have not tested its fitment on an OEM switch. The inner diameter of the sleeve was too small. I was able to hammer it into the derailleur's ball end, but there was a lot of friction between the ball and bushing, even with lube. You should cut out the inside diameter a bit - the outside diameter was too big to fit in the "cup" in the derailleur. Overall I would give it a solid 3 stars. I am sure that once adjusted it will serve its purpose. This was on my 2002 NB Miata which only had 54,000 miles so the existing OEM plastic bushing is still in great condition. With a short-travel shifter, the pivot point is different and puts more stress on the shell sleeve. So I think it's a reasonable upgrade if you're going for a short travel derailleur. I just didn't want to deal with modifying this part so I sent it back.