Noticed my reservoir leaking from the seals underneath the reservoir. I saw that Rovers North carried a rebuild kit for the reservoir. I am having a difficult time and spending many hours installing what should be a simple rebuild kit and feel that I should have been warned that for the trouble of installing this kit I should have just purchased a completely new master cylinder. I also don't see the point to why RN sells this kit (RNI169) vs. the entire rebuild kit RNF355. Additionally the new o-ring that sits around the outer bore of the rear part of the master cylinder in the kit is too big and does not fit tightly in the groove (see pic), it appears to be 1/16" larger inside diameter than it should be. My D90 is my daily driver and this kit is a big disappointment lacking in instructions and quality parts. I am writing this as a fair warning to all that replacing the reservoir seals is a much more difficult task than the picture in the catalogue makes it look.