the cuckoo won’t come out. It seems to retract too far and get jammed.
Welcome to the community @Michael_Resman . What I have noticed that I did wrong with mine when it chime but the bird didn’t come out.
Check this part.
When installing the spring and the brown plastic part (K3) make sure you press it down showing the top part of (P5). It should move freely when you press it. Press it down all the way. And make sure it slide in the bottom little part of K3 slide into the tiny slot of K1.
I did it correctly from the start but it comes out for some reason. But that’s how I fixed mine. Hope yours will work as well.
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Welcome @Michael_Resman hopefully the tips of @Tricia12 will work, good luck 
Welcome @Michael_Resman . If you have any problem, you can tell. Everybody can help you.
Typically, this issue is caused by a malfunction in the K3 and P3 connection device; pressing down on K3 should resolve the problem.
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I book marked this so when I get to this section I will pay close attention! I want mine to cuckoo! Thanks @Tricia12
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Welcome @Michael_Resman
The good news is that several on here have done the cuckoo so will be very beneficial in helping you out! I purchased the clock so will begin soon! I know I can count on this group as well as Robotime if need help!
Hi. Just got the clock for Christmas. Just like the OP, my bird won’t come out during the test. I’m not sure what I’m missing with the k3 part. The motor moves but the arm doesn’t. I don’t see anywhere for it to catch on anything. The white cylinder moves but the brown arm is stationary.
I have the same problem mine worked for a while then wouldn’t come out. Have you been able to solve this issue.
Regards
David
I’ve just had this exact issue.
Make sure the two small metal wires that attach to the bottom of the doors are seated in their respective holes fully and correctly.
One of mine was not in fully and seemed to be putting some strain on the sliding tray mechanism, which in turn cause the brown plastic arm not to move.
Caused because that spring on the white cog shaft pushes up and causes friction between the collar of the white shaft and the brown arm therefore allowing the white shaft to turn the brown arm. If there is too much resistance (the metal wire on the door not seated properly, causing the sliding tray to be lifted slightly), then the white shaft just spins.
It’s designed this way such that if you held the doors shut and activated the cuckoo mechanism, the white shaft and brown arm will slip, thus not damaging the worm screw and cog.
Hope this helps
Hola!!
En mi caso me enviaron un repuesto y éste funciona perfectamente.
Lo que no sé como conseguir es que el cuco cante a la hora en punto 
If you are running it on battery, make sure you remove the battery and try with plugging in usb-C cable. Most of the time it will work.