Hi Joe,
Last night, I used Hoppe's #9 Gun Solvent to pull apart and clean my tensioner on the Singer 27-4 or maybe 27-3. It was way easier than I thought and wow was it gunky. I also cleaned underneath where the thread travels down to the hook. The tension is better but the top thread is still winning the fight even with the shuttle tension cranked down. I am going to take more pictures to post to see what other suggestions there are. I wanted to do it this morning but this little nagging thing called a job stopped me since I was, as usual, already running late.
If I take the tension nut completely off, the stitch looks way better. Do I need a new tensioner? Or maybe a new bobbin shuttle?
I know, pictures would be most helpful, I promise will take some and post them this evening. :-) Dumb job, even if it does provide disposable income and pay my bills.
Gail