Okay, rookie question. I've never had a pickup with butyrate bobbins, but have heard people here describe how bad it can smell. I do remember as a kid opening my dad's ancient toolbox looking for something and a waft came up like somebody dropped their guts in it. It was unbearable. I thought the dog puked in it. But everything was clean. It was the screwdriver. Now I know why that was. Do they smell bad from the get go? Or get worse over time? Make your case smell? I'm very traditional and for authenticity and do believe they are another small ingredient in the PAF tone recipe, but is it worth it if that's the case?