I used the setup of change gears as recommended by Paul A. and the rope around the chuck as suggested by Wierd. I hung a small anvil on it to take up the slack in the gear train. It all worked well. It took hours, basically operating the lathe as a hand powered shaper with an acme form tool turned sideways in the tool post. I decided to make a 100 tooth "gear" for future indexing purposes. Although the change gear combo works to produce 100 divisions, it is difficult dealing with the lost motion. I now have a 100 tooth item that I can use directly on the spindle mandrel for indexing, that eliminates having to deal with lost motion. Thanks guys.
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update 2013/3/31 . Free software for calculating bolt circles and similar: Origin now settable to bottom left! All values positive. Click Here