There's nothing more aggravating than a sewing needle that skips, makes irregular stitches or puckers fabric - especially when there's work to do. Fortunately, Schmetz Needles put together a handy troubleshooting guide to help resolve such problems.
The guide isn't comprehensive, but - more often than not - will help put your machine back on track to finishing that seat cover.
Check it out: http://tinyurl.com/7nkgbcl