This is the reason I decided not to use my Kaweco classic sport demonstrator as an eydropper. That black feed housing ( the black collar part ) is not meant to come out in this model. If you do get it out you have probably broken something. The plastic is fused together and not meant to unscrew or push out. That doesn't mean someone won't be successful, but I think unlikely without damage. I much prefer making a converter as shown by Fountain Pen Day. This is absolutely brilliant.
Watch this video and do it. You can also use an 18 1/2 clear sac if you like to see the ink level. I don't think clear silicon sacs come in size 18. At least I haven't found one.
https://m.youtube.com/watch?v=Bl92XmaQ3Hg
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