NOTE: UNIT NOT FOR SALE
Unit came out in 2022  range from Mr. Christmas  with brass added sleeve on 22 tooth outer gear which was updated revision to improve design.
OUR COMPANY HAS PUT TOGETHER A REPLACEMENT GEARS 
4 pcs Gear set
A- 36122B (New Gear hole Size Change)
B- 28102B (New gear hole size Change)
C- 163A 
D- 503A square
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Adapter info: 9vdc 1200ma 2.1mm female positive tip