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Hi Tony!
I guess the practical side of design for the mass produced Newtonian Reflector is to make it easy to use and to transport. Otherwise they would be too heavy unless permanetly set-up in an Observatory. Yes, some bits do move and require adjustment..imagine if the factory made an error in colimation and you had to send it back to have it adjusted by them!!
Better to do it yourself...whenever you like..then enjoy the views!!!
Cheers!
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