Hi there to all, A few weeks ago I bought a Cartier Vendome fountain pen which is unused.I did not know that it was difficult to find cartridges for these pens. I'm still looking for some cartridges. Luckily a friend of mine had three cartridges. The pen was his father and it was lost or stolen, but he would still have some cartridges. Anyhow It was three cartridges. I got them and I try to install one of them, but it doesn't get punched. I tried it many times and push it very good, but the ball does not come lose. If I take the cartridge system in my hand in push the cartridge all the way up, then I see some space at the bottom. I don't know there should be placed something there, or is this normal? Does anyone have any experience with Cartier Vendome fountain pens on this matter? Cheers to all, Byte