You’ve figured out my secret Jimmy!
Actually I must confess…I have the benefit of a rewind button on the camera when recording so it just looks like I get it right the first time!
If the watch is being that stubborn then there may be something wrong. You might try putting just one gear in then put the bridge in place and check that everything spins freely. Then add another and try again. By narrowing it down this way you may discover that one wheel is going in upside down or maybe some other problem. If everything’s ok then you’ll get some good assembly practice. 
Please let us know what you find out.
Enjoy!
Bob
