Hi Folks –

I know that I use one of the “knock offs”, a Challenge 21MP (similar to the Vandy SP15), but I’m up poop creek without a plunger. I am calling on the collective wisdom of this group….

I’ve been restoring this press (some rust – lots of gunk) and have run into a problem with the Vibrator Assembly. It is in good shape visually but will not oscilate when the press is running. it moves to the far end of the bar and stays – it doesn’t return.

I’ve looked at the parts list breakdown and can’t find anything I might be missing. Ideas?

Brent

3 thoughts on “Challenge 21MP Vibrator Assembly Issues”

  1. Just like Vandercooks the worm crescent is inside the vibrator tube. To remove it locate the crescent holder screw on the face of the oscillating tube. Because dried ink has probably filled in the slotted head it will appear as a black dot.

  2. Brent,
    I recently had a similar problem. Is the crescent part in good shape and installed correctly? Also, you might check the set screw to make sure it’s allowing the crescent to rotate at the end of the turn. This is assuming that yours is a double-action vibrator. If it’s single-action I’ve got nothin’. Good luck!

    JoDee

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