Sewing Sabotage

Industrial sewing machines are great, fast, efficient, and are able to handle a wide range of fabrics and human errors. So I have seen my fair share of broken needles, 301 lock stitches with thread wrapped around the bobbin pin due to the lack of a bobbin... The usual but last semester there was a great deal of over the top repairs I had to do. This happens because people aren't trained properly and it leads to a drop in productivity, money spent to get new parts, and some times injuries.
The first problem is with a 406 bottom cover stitch machine. Someone didn't thread the bottom looper correctly which led to a huge wad of thread I had to take a razor blade to.

Due to that wad up and improper threading of the looper, the bottom cover stitch didn't catch. Because the person that tried to fix it thought the looper was threaded correctly became frustrated and kept sewing creating a wad of thread right by the needles. And out of anger someone tried to fix it by prying at it with a screw driver bending a stainless steal presser foot and not pictured are the 2 needles that person broke too. My students know not to try to fix anything, and no one else was using a cover stitch machine so my suspicions were pointed towards someone. This was a fairly cheap fix, I replaced the needles, cut out all the thread from the moving parts, threaded the looper correctly and was able to bend back the presser foot. It took me about 4 hours but it was a good learning experience.