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JDG Ring Crafters Mandrels are a perfect fit for ring makers trying to get started at a lower cost than the stainless steel JDG Pro expanding ring mandrels.
Ring Crafters Ring Mandrel - Size 4-8.5
JDG Ring Crafters Mandrels are a perfect fit for ring makers trying to get started at a lower cost than the stainless steel JDG Pro expanding ring mandrels. These mandrels are great for work holding rings and round objects for turning, 1/2 inch shaft sizes for easy lathe mounting.
Have you viewed the instructional video? Link below: https://www.youtube.com/watch?v=X8pwzD0jc4s&feature=youtu.be Simply measure the Outside Diameter of the ring core and choose a drill bit that is slightly smaller. Then "fine tune" the hole as shown in the video. Ring sizes run from 4 to 17 (that I know of)--in half sizes--each step is minuscule.