Product review (5 stars): Clear instructions and major installation tip
The basic problem is this a design flaw as they originally used plastic rollers that tended to easily break. This completely fixes that problem with stainless steel rollers.

Buy this OEM kit as instructions are clear as compared to comments from people who bought aftermarket kits.
The other key is that this kit includes an adapter that lets you use a regularl phillips screw driver if you don't have Torz (star head) screw driver.

Another thing I learned reading other reviews is that there is no easy way to get off the old adjusters other than just going ahead and breaking them off. This made the fix relatively easy and I got the whole job done in less than 20 minutes.