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How about the three grease holes along the top of the part with the central pivots for the bogey arms?
Those aren't grease holes - every grease lubrication point used a Zerk fitting. These features were added by the bogie manufacturer to facilitate tapping the three stud holes at the bottom of the bracket - they just drilled the holes deeper and they broke out through the surface of the casting. Usually they were filled with body putty and painted over. The breakouts are normally only visible on surviving tanks. (I guess the putty wasn't good for a 60 year life!)
Woody is the one to thank for the detail sets, he developed the process for us hobbyists. And as we all know, the best way to thank a business is by buying more product!
KL