Hi All I want to repair a few Aluminium sash windows and cant fathom how they come apart. The windows are plain Aluminium and are about 35 yrs old. Instead of having a counter weight they have a coil spring which appears to have a twisted shaft that runs thru the spring and then the whole thing is encased in a white plastic tube and placed between the moving part of the window and fixed side of the window. I need to replace 2 or 3 of these assembleys as the tube or spring is...

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