Mine would go to the top and spring back, as it should. All before the timer ended, so it would start up again. Timer would run out when it was only half way up the second time, causing the spring to not developed enough tension to send it all the way back.
If I wound the spring one more time, it would work better, but on the first run to the top, it would return hard and fast.
This new system is controlled perfectly, just at the right pace. Timer ends right when nell makes it to the top.
Bonus is, it comes with new motor and gears, so you can put everything back to stock