You can get these cylinders at Harbor Freight.
> The problem of getting heavy lubricant into a difficult location was a
> typical automotive issue trying to get 90w hypoid oil into the differential
> gear housing in the rear axle. The solution was effectively a big syringe.
> It was a cylinder about 2" in diameter, a plunger and a flex nozzle. Stick
> the nozzle into the oil, suck it up into the cylinder and then squirt it
> into the rear gear box. They used to be available in supply houses catering
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