Originally Posted by
redbugsullivan
Yes, the combination of CLEANING that bobbin area (recently, I removed over a tablespoon of chunky gunk from a bulking New Home) oil, movement and heat can make a huge difference. Sometimes PBlaster (spray penetrating oil) has its place.
Instead of insisting something move, PBlaster and an hour of soaking in the sun can keep metal from being bent. Yes! After applying oil turn it all around! Gravity can be quite handy.
When I say rock it I don't ever force it - you can very gently attempt to jiggle it - it seems like the slightest jiggling can get a bit of oil down those cracks. I had an old Singer 185 I was attempting to dis-assemble for a part. There was a set screw in it with only half the head. This machine was stuck up like glue. I dropped just a drop of oil down in there and then jiggled the part. Then I left it in a position that the oil could maybe go down into the screw. The next day my son and my husband were talking about my broken screw and my son wanted to look at it. He picked up a pair of long nose pliers and turned it right out.