The use of raw linseed oil only is allowed for redressing and the application for such purpose of any kind of wax or varnish, including heelball, is strictly prohibited. From Wordnik.com. [Manual of Military Training Second, Revised Edition] Reference
As this part of an Italian violin is not cut so mechanically as many people imagine, another and perhaps quicker way, if means are to hand, is to use thin paper and with some heelball, used by shoemakers, rub the edges that may be felt through and under the paper held in position against it. From Wordnik.com. [The Repairing & Restoration of Violins 'The Strad' Library, No. XII.] Reference
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