Hey all. New to the site. I have an old PP 655BP saw that runs great. Today for the first time I had trouble unscrewing the gas gap, and needed to gently use channel locks to get it off. It was nearly impossible to get it screwed back in too. I'm using a high octane, ethanol free fuel mix. Did that cap swell from fuel anyway? Is there any way to fix this, or might one of you have a replacement cap I could buy? Thanks in advance...Jay