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Bob, a professional watchmaker, recommends the application of mainspring grease by putting some grease on paper and pulling the spring through the grease while pinching the paper. Bunn Special, an amateur hobby watch guy, puts the spring into the barrel and then places a drop of oil on the spring. Probably this is ok but I would certainly give Bob the nod on this one. What makes the Bunn Special videos intresting to me is watching someone who is essentially on the same level as most or us struggle through these problems. This can also be a valuable part of the learning experience.