LOL my B2 had the same issue as well as one of my Orions. Too bad I didn't have any extra's, so I had to buy an RB o-ring kit. Funny thing though I have always used the pen trick, first try I tried to use tweezers but kept sending them flying and had to hunt for 5 minutes, so then I tried the pen, I actually have one cut down just past the bevel and it is in my tool kit, just Sunday someone asked WTF it was