Velux Hook to screw on to an extension pole

Velux charge around $45 for a hook on a telescopic pole. I have a telescopic pole from my paint roller which had a bodged up end I made (a bolt through the screw on splined wedge and much protective tape, nasty), now I have this nicer 3D printed one. 

This is the 4th iteration of my model, it finally has sufficient strength and a good fit on the threaded attachment. I have added the STEP CAD file if you wish to remodel for a different fit. 

The model it printed on its side so that any tugging to open the window is not pulling apart layers. Though on its side internal thread prints nicely without any supports.

For a cost effective extension pole that will fit this try: 
UK https://www.amazon.co.uk/ProDec-Contractor-36-Extension-Roller/dp/B09H3HCMFP 
US https://www.amazon.com/ProDec-Contractor-36-Extension-Roller/dp/B09H3HCMFP