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from the library (the author’s last name is Ingalls; I can’t remember his first name) and read the chapter on mountings. The author goes so far as to recommend the use of an old automobile engine block cast into a concrete base, with the telescope mounted on the flywheel. You may be able to get away with less than that, but it shows the direction in which one must go. Next summer I look forward to helping you build a proper mounting for the thing, if you haven’t contrived one by then. 
The problem of lining up the finder with the telescope is one I ran into. It is tougher than it looks, as you have apparently discovered already. It is necessary to somehow get the telescope pointed at some recognizable object while it is held absolutely rigidly in place and then adjust the finder so that its crosshairs (or the center of its field, if it lacks crosshairs)