My company makes a LOTO for compressed air. It only has (2) padlock locations. I want to see them add 2 for a total of (4). They are resisting because they say a hasp kept on the operators person will work and it is cheaper. My argument is that hasps are extra work and inconvinience. What is your experience with them in the field, industry or practice? Here are links to the existing products and concept idea and I welcome any comments on them as well - http://i173.photobucket.com/albums/w45/biyonic/Safety/SMCvhs20.jpg