I had noticed that my wife's M666 SLX brakes had the same threads in the calipers where the pin goes through to hold the pads as my XTs. I looked up the part, its called a "Pad Axle". Found them online for cheap and ordered some.They come with the little retention clip. This will replace the cotter pin and possibly cut down on the clacking sound that the SLXs have when the pad hits the rotor and moves in the caliper. It took about 2 minutes to change them out. I was somewhat apprehensive that the cotter pin had mashed the threads in the caliper but the new bolts spun right in smoothly. Great 1st wedding anniversary gift, right? right?
The Shimano part # is Y8JZ98010
This is where I bought them :
Shimano XT BR-M785 Pad Axle & Snap Ring
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Thread: $1.99 SLX upgrade
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