I just bought a used Singer sewing machine model 6234. It is having major tension problems. I have tried different threads, new needles, moved the tension bar up and down - no difference. You can pull the top stitches out with out much effort. I have doubled checked several times to make sure I am threading it correctly and I am. Any suggestions?

Diane E, April 2017

have you threaded the bottom bobbin correctly?

Is the needle in the right way round? (My Mum had all sorts of problems with that once)

Manual here: https://www.manualslib.com/manual/609679/Singer-6234.html

acp, April 2017