Does a scroll saw need to be lubricated? I checked the manual and noting is said about lubrication. I have read that some people say they should be lubricated with Molybdenum disulfide (MoS2) some say 3in one oil. I have a WEN LL2156 21-Inch 1.6-Amp Variable Speed Parallel Arm Scroll Saw that is about 6 months old but now is making a noise that seems to be in the arm.