I don't think one should have to go to these measures with the seam it should be a rubber casing around the housing right? Second I thought you mentioned the bottom of the Tesoro where the shaft connects to the Case itself I thought you meant the hole on the shaft to the box is exposed. I had this on my old Whites unit..I had too double check my Vaquero out here...heew you had me there, so what you can do is get some computer air and blow this off when you get home no need for a bag or case even on slightly rainy or muddy days buy a cover for it.