BENQ W5000 projector lens unscrewing question

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A friend of mine who is a electronic service engineer is having trouble removing the lens from the body of a benq w5000 projector.

This model of benq is trifle unusual, usually on a normal projector the lens can be unscrewed by turning the lens in a particular direction..however this projector seems to be built differently..we tried every possible way to unscrew it but were unsuccessful.

Can someone show us the proper way to open this projector...Thanks in advance....
 
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