Replacing the wire
It is possible to replace the wire without releasing the spring and without dismantling the balancer.
Fully retract the wire and make sure that the wire end is visible in the balancer housing slot.
Lock the wire drum.
Refer the below link to lock the wire drum correctly:
Remove the workload.
Pull out the wire end through the balancer housing slot by pushing the opposite wire end.
Remove the locking bush.
Pull out the wire through the balancer housing opening.
Push the replacement cable through the balancer housing opening and further out through the balancer housing slot.
Attach the locking bush.
Push the wire back into the housing.
Attach the workload.
Unlock the wire drum.