This reveled the source of [Peter’s] problem; no lubricant, not on the linear rails and not on the lead nut or lead screw. Over time, the un-lubricated Z axis linear ball bearings had worn 4 ...

Is your garage door creaking and sticking? With a little garage door grease and these clear instructions, it'll be rolling smoothly again in no time.

Some vehicles have upper and lower front ball joints, and depending on the suspension design either can be the load-bearing joint ... that don’t need periodic lubrication (“greasing” them ...