The inlet where I fill the fluid for my Yamaha 115hp, 2002, the threads are stripped on the nipple/filler inlet (male). The threads inside the cap (female) are fine. Does anyone know how to fix this...the threads on the nipple are plastic as is the cap. Can they be replaced/repaired? Is there an alternative to a cap where I can plug the filler inlet with a Plug or some type instead?