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| [* black] The shaft of the motor is a D shape, and the set screw needs to be tightened on the flat side of the shaft. | |
| + | [* black] At this point, you may need to put batteries into your main unit, plug the ribbon cable back into the daughter circuit board, and allow the motor to rotate so the flat side can be lined up with the set screw. |
| + | [* black] On the main unit, screw the battery housing back on (undo the step at 1:11 on Surepet's video), insert batteries, and press the open/close button so the motor attempts to open the lid. Then pull one of the batteries out when the shaft is aligned as seen in the image. |
| + | [* black] Be very careful not to touch the main circuit board in the main unit with electrical tools, or to cross any wires when you do this. Once you've gotten the shaft aligned, take the batteries out. |
| + | [* black] An interesting point here: there is no limit switch telling the motor when to stop. When these metal pieces come into contact with its housing, the motor can't spin anymore and will draw more current to attempt to keep going. Only then does the circuit stop powering the motor. |
| + | [* black] This is not the most robust design, as this is what causes the set screw to loosen. You'll have to keep re-tightening it over time, and in extreme cases, this may lead to the motor housing cracking, or gears inside the motor breaking. |