I have noticed many other threads detailing problems mainly finding someone to simply tune up a sewing machine even taking advantage of an unsuspecting trusting customer discussed further here. Years ago, I had a limited working relationship with the local sewing machine repair shops (there were 2) in my area. Over the years, one retired and another tried to sell his business (with no success), then closed forever with no other shop available nearby.
So I decided to go the only option available to me; buy simple, but durable, mechanical sewing machines (i.e. Janomes), and service it myself as needed. When the sewing machine breaks down after a long spell (10-20 years or so), replace it with another new one. How to accomplish this feat yourself? See below for the 2 information sites online where you can experience and follow along yourself (it really works)!
Preventive Sewing Machine Maintenence
Simple Monthly Sewing Machine Maintenence
Lastly, An Old Sewing Machine (the same model and make as my first one I owned) being serviced. I got into the habit way back then to care for it just like the one being shown here: http://sewingschool.org/2011/05/19/b...ng-and-oiling/ My own sewing machine finally gave out and died after 25 years of heavy, constant sewing. So servicing it yourself does pay off in the end.