How do adjustable height lamps work?

I will be designing any ecological bulb for just a school undertaking, utilizing supplies at home. How do lighting fixtures that happen to be adjustable tall (simply by pressing recorded on ii little buttons on both factors to their holes, which usually mouse click outside of additional holes in the event the stay continues to be familiarized in excess as well as downward) in order that I can implement the item in to my very own designing?
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Go to a store and look at one. You should be able to figure it out from there, it's pretty simple.
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"Cut your wood surface to the desired dimensions with a table saw or hand saw. "
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