Cottrell Supplies Boydstun Replacement Parts Are you tired of your decks binding or constantly having to re-grease your screws on Boydstun equipment? Cottrell has a solution. We can now offer replacement stainless steel screw and Nylatron nut combinations for Boydstun equipment. This is the same, proven technology that has been installed on Cottrell equipment for years. Finally, you can throw your grease cans away. Please call the Cottrell Parts Department at (800)827-0132 for more information on screw replacements as well as other Boydstun parts.