While exploring the Pangzhen slums and Back Side Pavilion area, it is likely that you will either come across a Backstreet Cellar Crank, or an empty socket that asks you to get the Crank. These locations, and the Crank in itself, is also a requirement to close a side quest which has a super useful accessory as the reward.
If you are looking for the location of the Backstreet Cellar Crank, or where to use it, or, alternately, to close A Mother’s Heart side quest, this is how to go about doing all of these in Phantom Blade Zero
Backstreet Cellar Crank Location
The Backstreet Cellar Crank is located in a chest that you get while on your route from the Back Hill Pavilion bell to the Pangzhen Slums bell.
From the Back Hill Pavilion Slums bell, make your way back across the bridge, and go right – you will spot a set of enemies waiting for you – nothing that should cause you any trouble.

Continue down the linear path, and you will eventually arrive in a place, where, inside the building is a ladder going up, and to your left is a ladder going down.

As soon as you come out, if you look below, to your left, there will be a chest. This is the one that has the Backstreet Cellar Crank. Drop the ladder, and get the Memory Flower: A Mother’s Heart, and ring the Pangzhen Slums bell.
Interacting with the Flower would have also started A Mother’s Heart side quest. Ensure that you do that, since the next place where we are going to use the Crank has closing this quest as the main, and only thing to do here.
Backstreet Cellar Crank Use

The Backstreet Cellar Crank is required to get the second Memory Flower to close A Mother’s Heart side quest. To do that, from the bell, take the ladder on the left. Use the climbable wall, and continue on the path that winds upwards to get to the location where you need to use the Backstreet Cellar Crank. Insert it in the socket to open up the path behind.
Closing A Mother’s Heart side quest
Ensure that you have equipped the Dread Axe / Iron Gauntlets Phantom Edge. Enter the area, defeat the three broken puppets, and get the Polished Broadplate Metal. Take a right, and get the other 2 broken puppets as well. Get the Polished Twinned Metal, and take a left – the only path available. Grab the Polished Forged Metal, and take the ladder.

Defeat the spear and shield enemy – this is why we needed the shield-breaking Phantom Edges equipped. Take him out and interact with the Memory Flower to complete the set, get the 5% increase in max HP. Doing this also marks A Mother’s Heart side quest complete, and gives you the Merciful Dew Medicine. This is a pretty powerful Medicine – it has 5 uses, and restores 60% HP over 10 seconds.
Also loot the chest – since you are here, might as well, to get Precision Mechanical Gear, Blazing Darkfire Charcoal, and Camphor Timber. You can now retrace your steps, or use a Traversal Talisman back to the bell and explore further.
