i needed my oil pump rebuilt so i bought the pump kit and a 9/16 reamer for the bushing . i installed the bushing and then took it to an older guy that sells part and works on N's along with the reamer . the older guy said it would only take a few minutes to ream . he attached the bushing guide , put his reamer in a 1/2'' drill and started to ream . he told me he had to grind off the reamer to fit his drill which got my attention real fast . he started to ream the bushing and his reamer was so out of round and dull it was jerking him and shook tools off his bench . he said i just sharpened that thing ! i suggested 4 times that he use my reamer but he would have none of it . now im getting really nervous, he finally got it through the bushing . i grabbed my parts and got out of there . i get home measured the bushing and its worse than the one i took out . i got the new gears out of the package to look them over . i put the gear on the drive gear shaft ( the one that is supposed to be pressed on ) turned it upside down and the gear fell off. now i have to send back the rebuild kit , order a new one , order the reamer guide . if you dont know about bushings , reamers , and gear backlash you might want to have a machinist do the work . reamer 40.00 , parts 45.00 guide kit 117.00