I would bet that you know already that sewing over pins can lead to broken pins. But have you ever thought about what it does to your needle?
If I am having problems with tension, the first thing I do is re-thread my bobbin and top thread. The second thing I do is replace my needle. I keep a used prescription pill container in the drawer of my sewing table, and damaged pins and old needles go in there.
Linking up to the Tutorials Archive with Late Night Quilter.