You can buy a diagonal from many on line retailers-- here is one:http://agenaastro.com/optical-accessories.html?cat=28They all come with a thumbscrew(s) to hold the eyepiece.
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You can buy a diagonal from many on line retailers-- here is one:
http://agenaastro.com/optical-accessories.html?cat=28
They all come with a thumbscrew(s) to hold the eyepiece.