Singer XL6000 endless bobbin
When winding the endless bobbin, I keep getting the message that I need to remove the bottom spool. In the past I would get this from time to time, I removed the spool and then it would wind. Well, now I can't get rid of the message and can't wind the bobbin. I have cleaned, taken off the throat plate and cleaned and I don't know what else to try. Any suggestions?