Montblanc 144 Fountain Pen Inner CapIf the cap on your 144 fountain pen is loose it may be because the inner cap cracked. You can unscrew the star tassie at the top of the cap and remove the inner cap to check it. If cracked you need a new inner cap.This is a Montblanc Meisterstuck 144 fountain pen inner cap. There are two types so be sure yours looks like this one with the tapered top. Yours could be a different color which is fine but ...the shape need to be the same as this one. This inner cap is very clean with no damage. This only fits a 144 fountain pen, not a 163 even though it looks similar.This part is GUARANTEED GENUINE and as described by my feedback, 100% money back guarantee and reputation!! Check out my MyWorld eBay profile to learn everything you'd want to know about me, my pens, shipping and my business http://myworld.ebay.com/speerbob OTHER GOOD INFORMATIONI am one of ebay's largest and most trusted pen sellers on ebay since 1998. I have been in the pen business since 2000 and am a member of the Pen Collectors of America and know the world of pens very well. You'll always get great service and great products. Everything I sell is always guaranteed authentic (I will NEVER sell a fake! NEVER!) and as described!! 100% GUARANTEED, or your money back!! Notice my Very High+, near 100% positive feedback rating. I get good deals and will pass the deals on to you!! I get some really special, rare, and unusual pen sourced from all over the world, so keep watching my auctions and store!