Hi: My DM4400 has a air-over-oil pressure amplifier that I have filled and it works fine to operate the push-bar and release the tools. The push-bar itself operates within a block that measures 4" x 4" x 2.1/2", and above that is a 2 x 2 x 2 block with a sight-glass that looks empty. How do I put oil in that upper block? There is a circular thing, about 1.3/4" diameter x 1/2" tall above the 2 x 2 x 2, and the circular thing is right under the spindle motor connector box. Am I supposed to get that out of there to put oil in? Or pump it in from somewhere else and open a bleed port, Or? thanks, Pete

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