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Dear list,

I have heard about these nifty little tools several times in the past,  
but have been unable to find one at any of the usual sources: a laser  
pointer with an objective threading that is aligned with the optical  
axis of the objective. The result is an retrograde laser beam, making  
alignment of a new laser a piece of cake (or so I hope).

Does anyone have a suggestion of where I might find one of these?

Cheers, Christian