I have a 20 watt diode laser and the laser holder is loose and wobbly on the Z carriage. I looked at the si vle bottom wheel and there is no adjustment as the plate holding the wheel is pinned and has 2 screws installed(upload://euKOhLK1snYL84jaJKXcnhhl7nO.jpeg)
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If I’m thinking of the right type of machine, the wheels that roll against the frame have eccentric screws.
Turn the screw to tighten and loosen the carriage.
