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I have drilled a 4mm hole into the axle. In the middle of the axle I drilled a second hole
which goes from outside until the center of the axle and let the grease come out. At the
position where the grease fitting is mounted, I have enlarged the hole until I could
press in the fitting. Be careful when you press in the fittings, you should use a special
tool for that, otherwise you'll destroy them when you are using just a hammer.
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