I currently have the camera and filter wheel on the scope but want to temporarily remove the filter wheel and image just with the camera. I removed the filter wheel and reinstalled on the scope but was not able to focus due to not enough travel length in the focuser. Is there a spacer available to substitute for the filter wheel? I think it is 3" diameter threaded but not sure of the thread or the length required. Thanks.
We don't have such a thing. Check with the telescope manufacturer, and failing that I'm sure PreciseParts.com can make a custom adapter for you.