In your sliding glass door session, I was very disappointed to see you using a can of WD-40 and calling it a spray lubricant. You know it is a solvent, with only short term limited lubricating properties. Yes, it disolves the greasy grime on the track, but it is not a good lubricant. You wouldn't want a lubricant that stays on the track area, anyway. And, more often than not, the little wheels, especially if made of nylon or other plastics, have failed and must be replaced. That was not a good "trade secret."
