Needle is hitting the bobbin assembly on the downstroke; cleaning, oiling and new needle do not help.
Also, there are no “timing scores” on the vertical bar leading up from the needle on this model of machine.
This is not an industrial machine.
I already own the manual; it doesn’t include instructions on how to time the needle/bobbin hook or adjust their positions.
I’ve changed needles. Nothing appears to be wrong with the needle clamp.
There are various models of sewing machines that need the timing adjusted frequently, as I’ve now learned by reading online postings from frustrated sewers.
I sew with heavy fabrics, and I just erroneously switched to a shaky sewing table – which makes a timing issue more likely to happen.
I may be a member of “wefixit” Yahoo group; will check there if nothing else turns up.
What do you think? Answer below!