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In response to the difficulty question....
I play in and know of at least 2 gyms locally that use adjustable height backboards. They seem to be very common around here in elementary and middle school gyms. There is a manual hook thing wich gets inserted into a loop thing on the backboard and then the hook thing gets twisted and the entire hoop either rises or falls. It is like a giant screw and the backboard goes up or down. It is very simple. You turn the mechanism until it will not turn and then it is at the max and it is 10'. Very simple and it must not be cost prohibitive because the towns I am talking about are very cheap with their gyms fixtures. This method is by hand it takes just a few minutes to raise or lower the hoop/backboard.
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