Next I am going to show you how to put chain back to drive unit or bracket. Now what you can see is the chain is outside of drive unit or bracket. You only need screwdriver as a tool. Both slot head screwdriver and phillips head screwdriver are ok. Then the trick is First of all, to put chain into drive unit or bracket as much as possible. Have a look on top of it. chain can’t be put inside the unit or bracket. There is a cover on top of unit or bracket. This cover prevents chain from sneaking out. The second step, it is also important step. hold screwdriver upside down. and press on the top of the chain. then hold by your left hand. then turn axis clockwise by your right hand When listening a ‘Click’ sound, which indicates chain been put back into unit or bracket already Now I can pull it up and down. Thanks for watching!