How to change the sliding switch of broken aluminum window?

There are two chutes beside the window.

This part of the chute. There are screws to fix the chassis. Remove the screw that holds it. You can put. This can slide up and down. It's locked. If there is a new one to be replaced, just replace it directly according to the unloaded position. Of course, this length is also very important. You can only buy the same size.