WD-40 is a water dissipater, hence the name. It will also help loosen rusted parts, but it does not last very long. You are better off using a PTFE Grease or Oil. Just rubbing PTFE Oil on the parts that contact will help and last longer than WD-40. Works great on swivle clamp bases and turntable bases as well.
Machines: Gamma 6004 2-point w/ Wise 2086 & Babolat Sensor Dual