SainSmart Genmitsu 4040-PRO CNC Router User Manual page 21

3. Align the screw holes on both sides of the spindle holder you purchased with its fixing holes and tighten the screws on
both sides.
4. Attach the new spindle to the spindle holder and tighten the spindle fixing screws
5. Note that the order of the above steps should not be disturbed, otherwise it will make the installation more complicated.
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