Hi all, I Repair and service mostly vintage wrist and pocket watches busy repairing a generic watch containing a French Ebauche FE 3611 movement. The missing stem according to Ranfft is a W3246. I can't see it in my Flume book or dimensions on winding stems.com . Idealy it would be easiest to convert to a bestfit number then I could look up interchangability or find something dimensionaly close that I could modify. Are there any charts out there to change from ronda, bestfit and W stem standards.