82 300TD Semi Functioning Driver Window

I am about to take my front driver side door apart to repair my window,
according to Kent's manual on 123 door repair...
The window motor works fine, the mechanism is just not pulling the window
down. the regulator comes down, because I can then open the window by
pushing it down, and then when I push the button to close the window, the
regulator pushes the window up fine. Do you have any pro tips for what part
I might need to remedy this situation. I have already purchased a regulator
kit, part no. 123 720 01 14 from Mercedes, is this the part I need?
Thank you in advance!

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