Mark

That's the only one I see extendable

Any more clues on yours? Is it bona-fide Calif Duster? Or a knock-off? 

I agree that I need something longer to do the side & back windows on JD 8xxx type tractors. Seems getting to that rear window often is dangerous climb. Same with RH window on tractor & sprayer. Normally you need a ladder to get up to them. Extendable handle would be nicer.