I wouldn't do any work on my sewing machine. It's computerized and I had problems with the needle threader and was manually moving it back in place (it would get stuck after threading the needle) and finally took it to the dealer. It took him over a week to fix it. I shouldn't have moved the needle threader. I really screwed it up. Thankfully he was able to fix it after tearing everything apart and he didn't even charge me. He told me to keep my mitts off the machine when it came to repairs. And I am going to obey him (I never obey anyone).