just as in hand engraving, you'll end up with a ton of jigs, plates, etc. you must be very careful to assure the template is in exact alignment as to the way your work is situated. i've done a lot of very small baby rings with a flat measuring 3mm. if attempting to align a template with something this small, problems arise quickly. the regular drag diamond is so large in comparison to the ring surface, it's nearly impossible to do this accurately i solved this problem easily. i chucked the back, flat end of a regular cutter in my lathe and drilled a hole to accept a very narrow dentist drill . this allows for a much more accurate alignment.