I purchased a Montblanc 146 from eBay. I also bought tools to remove the nib and piston units. All went well when I opened the piston end and remove the piston. I greased the barrel interior and screwed the piston unit back into the pen. Sadly, when I unscrewed the nib, I found the lip of the "feeder case" to be broken. I think I need a new feeder case. So, two questions: 1. How to I remove the existing broken feeder case from the barrel? Does it screw out from within the barrel? 2. Is there a source for buying new feeder cases? I checked on eBay, but didn't find any. To help ID my 146 year etc.: 2-tone nib, ink view with stripes, nib socket holes at 4 and 8, tracking number etched on clip, "Germany" on clip. I'm experienced with pen restoration, but I'm new to Montblancs. I know I could send the pen to Montblanc, but I'd rather fix it myself if I can get the spare part. Thanks very much!