These are the most common issues with sewing machines:u003cbru003eReplace the Needleu003cbru003eNeedles are the simplest and cheapest part of a sewing machine to replace, yet they account for 50% of the seam. A sewing machine cannot function properly without a new needle.u003cbru003e1- u003cstrongu003eWash the Machineu003c/strongu003eu003cbru003eLint and fluff must be removed from underneath the throat plate of sewing machines on a weekly, if not daily, basis.u003cbru003e2- u003cstrongu003eExamine the Top Threadingu003cbru003eu003c/strongu003eIf there are large loops on the back of the fabric, the top thread is not in the tension discs. Make sure to thread the machine with the word PURPOSE.u003cbru003e3- u003cstrongu003eIncorrect bobbinu003c/strongu003eu003cbru003eWith so many various brands of sewing machines, each of which uses a different size bobbin, it's easy to use the wrong size. Just because a bobbin is made of plastic doesn't mean it's useless.u003cbru003e