I'm jealous of that Delta. I use a product called zoom tubes on ceiling fan bearings, not sure if it'll work here but worth a shot. Can't find the oilers like I have a bunch of,got it from Grainger usually, but same product, good for electric motors. https://www.amazon.com/Norvey-Zoom-Spout-Lubricating-Oil-ZS75A/dp/B000HACY3Y