The mechanism that engages the hand reset "mode" is broken off and without that mechanism, I cannot make the gallon hands reset to zero. Attached are photos of the bracket. It has numerous rods with sprockets attached to it. If someone has a complete clockface mechanism, I would consider purchasing it. Not all 850 clock mechanisms were the same. My pump has the clock mechanism associated with pump serial numbers 369,972 - 499,999.

broken piece photo 1.JPG