I have a Butler Super Shaper and at the rear I always thought it had a oil cup. WRONG. One of my customers informed me the Stauffer grease cups were common on old traction engines and on ships Learn new something every day. The lid has a spring loaded plunger as you screw the lid down it sticks out the top as an indicator of how much grease is in the cup. I have seen a number of photos of Butlers Never seen the indicator sticking out.
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