I have a mid 1980s MB that sat unused for decades. I cleaned out the old ink (which took a while) and refilled it, I wrote without any problems but the next day the pen was dry again. I refilled yet again and had the same issue - lovely ink flow until there wasn't any. Is this normal with a pen coming back into use? I contacted MB by email and the response they sent back wasn't very helpful at all. I'd like to use the pen regularly but I don't know why the ink seems to be evaporating. Has this happened to anyone else? Thanks.