Yes, you're correct. The motor on the left is the original. After looking at the site again, I can see that the original motor in this picture, and the finished product motor picture have the diode in opposite directions in regard to the ground.I think that is where the confusion lies.
Just to make sure I'm understanding, is this the basic theory of what might be going on here?: Swing stops, transistor is hot. I replaced the motor and the transistor still got hot. I replaced the transistor and the new transistor got hot. So, is it possible that the original motor failed and caused the transistor to heat up, I then replaced it with a new motor with a backwards diode, which also caused a hot transistor, and then I just replaced the transistor which was pointless?
(I'm at work today and I haven't been able to try out the suggestion to remove the motor and check the transistor. It'll have to wait til this evening.)
If I do flip the diode, will I need to get a new one? Is this one fried?
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