I guess there is a mixed up of threads... Magweb answered about red lines here: http://meshmixer.com/forum/index.php?topic=2259.msg5640#msg5640
Sorry about the spam! Had some technical problems...they should be fixed now.
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For the tiny or even zero area faces it sometimes seems that not the whole boundary is selected but it is and welding works here also on your flle.Indeed! I was disdurbed by the way it looked so I didn't even tried to weld.
For the second, third... welding you also can select the whole FaceGroups (for each now owns a single boundary) that's easier.Clever! Another way that works (when turns are far away enough) is to select turn tips using a big volumetric brush.
Excellent! But I had a hard time welding turns together. It looks like after splitting the torus, some very thin triangles remain, preventing double click on boundary to select it completely. What did work was to double click and expand selection (expand + contract doesn't work either). .mix attached.
As soon as I can figure out how to attach photos I'll update this postTo allow attachments click on "Additional options" at bottom of reply field.