You need to lubricate everywhere motion occurs as well as anywhere friction happens (joints and gears). The needle hammer is the most obvious point, but the shuttle friction points are key spots as well. I find it is more important to clean out the dust and debris than actually lubing the parts.. Lots of loose threads and fabric dust seem to accumulate all over and especially where lube is present.. First clean off stuff and then lube in those spots... Also good to replace grease on gears and bearings every couple of years too (more invasive, but keeps the wearing parts healthier)...
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