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Tig
welcome aboard.
I have used a 50mm finder as a guide-scope, and it works very well. There is no reason why your 6x30 won't work as well.
In my case I removed the eye lens (it was actually an eyepiece for all intents and purposes) and simply affixed the web-cam in the eyepiece's place. I am at a loss as to why the focus seems to be way longer than your actual tube length, in my case the focus point was quite close to the end of the tube. You will need a fitting in the end of the SPC900, something that screws in and then see if you can adapt that to the inner section of the finder tube. Trail and error, lots of both, but it is something that can be done (better in fact) in the daylight.
Report back with how it goes.
Gary
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