52 Ladies Leader hub question

[Truckerjosh]

So my oldest project bike has what looks to be a zert for lubing the rear hub. I did some surfing but couldn't find anything really pointing to what it is. Rear gearing is skip tooth if that makes a difference.

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[bikemonkey]

Looks like it is just an oil port with a hinged cap.

 

[island schwinn]

New Departure oiler cap.if your bike is a 52,it's not a middleweight.