Another dumb question

[Kw9006nz]

Have you changed your receiver dryer? It sounds like a metal spur that's cutting your oring. Also are you pulling a vacuum on your system every time you change orings? If not, I'd gather you badly need a new receiver dryer, replace all associated orings pull a vacuum to 20-26 in mercury and hold it for 30-60 min. There should be no notable drop in vacuum over that time