If you can use a sealed bearing, this one below has the correct dimensions, or maybe you could make some holes in the seal or take the seals out if you need gear oil going through it. It’s at Amazon.com, but for some reason I can’t make the web address show, but you can find it at Amazon by running a search on “1616-2RS” or run a web search on the number 1616-2RS for a lot of other places to buy it.
1616-2RS Sealed Bearing 1/2″x1 1/8″x3/8″ inch Miniature Ball Bearings
Brand: VXB
Price: $9.95 & FREE Shipping
Best price
Specifications for this item
Bore Diameter 0.5 inches inches
Brand Name VXB
Item Weight 0.480 ounces
Material Steel
Measurement System Inch
Number of Items 1
Part Number Kit21047
UNSPSC Code 31171500
https://www.amazon.com/1616-2RS-Sealed-Bearing-Miniature-Bearings/dp/B00J5OL2OU
Dave
