At this point the dovetailed channel for the pearl slide is completed and the mortise and channel for the hair is cut freehand using different chisels. The pearl slide or ‘recouverment’ is then fit and trimmed so it fits perfectly on all sides. Finally the bottom of the frog and the heel is filed so all parts are flush with the ebony and smooth. The pins, which have been left proud, are filed off at this time and usually disappear. The pins on a new bow are tight and very difficult to see but over time the miniscule movements of the ebony frog due to changes in humidity rock the pins slightly. So in older bows the pins are usually noticeable.
The frog is now well advanced and all that remains is the underslide or ‘coulisse’ where the frog joins the stick. Here a silver lining is usually fit and pinned in place and a bronze eyelet screwed into place. At this point the frog is complete and ready to mount on the stick but the polishing will wait until the bow is nearly completed.
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