Plastic Sheaffer Feed Collar

[wifger]

While removing the nib and feed from my vac-fill Sheaffer Lady Tuckaway I snapped the feed in half. Upon further inspection I noticed the feed was significantly undersized and there was a plastic collar at the bottom of the feed. As you can see in the photos the section diameter was around 7 mm.

My question is 1) Is this collar an original feature

and 2) When finding a replacement feed should I get one around 7mm so that if fits the section or 2mm undersized and use the plastic collar.

 

Thanks for any help.

[FarmBoy]

1 Original equipment

2 You will most likely find the entire assembly