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Master cylinder holes

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    Master cylinder holes

    I've flushed the front brake system,changed pads,checked calipers and I still have spongy brakes. I then stripped the mc , cleaned it up and rebuilt it.I now can't get the mc primed. My bike is a gs750 e 1981.my question is ,I read of two holes in mc I can only see one.THe resevoir has a tab and something is going on under it,is this the second hole.I also read of two grooves in piston body for circlip and dust seal,mine only has one. Can anyone through any light on this.
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