I needed a replacement spring for the scissors on my beloved 36 year old Swiss Army Knife. Angel, the person who served me, produced a spring and asked if I knew how to instal it. When I answered no and that I hoped that she would live up to her name, she said that she would endeavour to do so but she hadn't done it before. I returned about 30 minutes later and she announced that she had successfully installed the spring, much to my delight!

Approximate cost: $1.45