I prefer denatured alcohol - some times I use Naptha - it depends on which one takes care of which oil. Some times one works better than another. The TFSR doesn't have anything specific to Kenmore but the part about adjusting the tension should work. I found good info here:
http://mysewingmachineobsession.blog...sembly_11.html I'm thinking there is good info on "bald heads" and tension setting somewhere, too. Tammi has info on tensions on her video:
https://www.youtube.com/watch?v=kzFX...AyBQ2l-Mzkw7ew There may be some info on bald heads tension problems somewhere on QB - maybe you can search that out.