I own a Pelikan M300 and I am having problems with keeping the cap posted when writing. For some reason, it does not post securely, and will fall off if I turn upside down when posted. As you well know, this is a tiny pen so posting is a must, for me anyway. I was just wondering if there are any other Pelikan enthusiasts out there who have experienced the same difficulties, and if so, how you managed to resolve the problem. I bought the pen new back in 1997 and I don't recall ever having a problem with this. Any feedback would be greatly appreciated.