Hi.
I have just today found an acceptable solution for me to trace images and get single lines instead of double lines.
I decided to bump this topic to the top to see if this procedure would help others.
It uses Inkscape which I believe many people have used as a tool at some point.
The instructions for installing the python scripts. etc. to Inkscape are downloaded here… https://inkscape.org/en/gallery/item/10567/centerline_NIH0Rhk.pdf
I like the results. I don’t have to edit the SVG image for the double lines. Some node editing was needed to attach some lines to match the original though.
I hope this is helpful. It’s kind of a pay it forward to thank this group for all the help it has provided me.
Craig