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Hi Wade,
The images of Kevs on the thread that he supplied the link to should help.
I have been using an 1 1/4" TuBlug with one of Howie Glatters 635nm (I think) lasers for collimation of my scope prior to and during my planetary imaging sessions and it is the most accurate double pass laser system that I have ever used. I chose the 1 1/4" version as my filter wheel and CCD nose cone are also 1 1/4".
Regards
Trevor
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