I just completed Nova Montgomery's one day class on cleaning Singer FWs. She addressed the motor issue and her motor lubricant has a tip that fits inside those openings. She had scientists work for 3 years on her formula. Check out her website, too, as maybe she has a video on lubricating the motor. I am not expert enough to advise on what you should do. I can tell you that when following her class instructions, old grease came out of the opening to be replaced by the new lubricant. I am not into taking old things apart and trying to get them back together unless there's no other way. IMHO