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Originally Posted by carlog80
drilled my pinion to fit the 5mm shaft of the 9xl and lost 2 grub screws already.(I shaved of some meat on the 9XL shaft so grub screw has something to bite on)
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I think that the drilled pinion might be causing some of your problems. The gears are cut on precision machines so that the hole is PERFECTLY concentric (in the middle). If you think about how fast 50,000 RPM is you can see that the slightest imperfection can cause big problems. Thats how vibrators work. Its just a weight with the whole drilled offcenter. Just for the record im talking about vibrators in cell phones!:005: