Blue cone should tumble out without much effort. Perhaps yours is "gunked" in? Maybe it's a different color because someone "re-engineered" the original insert? A few years ago I purchased a plastic case of metric viton o-rings from Harbor Freight. I think I got 3,000,000 rings of different sizes for $1.98. Anyway, one of my best investments. I've used them on petcocks, carbs, forks,...