I am cleaning my Mont Blanc 145 and I saw on a Mont Blanc video that it appears you need a mont blanc tool to remove the nib and feed. I think I got it pretty clean just by flushing warm water through it many times. (I haven't used it in years and didn't clean it before I put it down-- I know better now). Does anyone know if the nib and feed pull out or screw out and/or does it take a special tool to remove the nib.
The good news is that the piston seems to be working fine.
This is my only good pen. All of my others I bought for <$60. This one some one gave to me in 1982. Now I see they cost >$400.