Searching for TputII 15 in arm window operator

20year old awning bathroom vinyl replacement teeth worn on top arm will open but gets to last 2in and it won't close crank just turns can you find me a replacement easy removal and install if I can the correct replacement TPUTII stamped on arm can't get the white cover off handle pop right off

When looking at the pic with the tap measure when closed 15 inches open it is the same lenght six screws 3 on each side hold it to the window frame all vinyl I did put it back in waiting for your replacement I'm very optimistic you can help lol

 Thanks