I cleaned out the lint around the bobbin case and didn't realize how much builds up in areas where you can't see it. So I was surprised to see the "matress pad" under the throat plate.
Now the plate comes off regularly as well; but if you don't know.....
(When I first started sewing, I did not realize that I was supposed to change the needle. I thought the clunking noise and the big holes were normal. :oops: :lol: )