Filing pierced work

G’day; I recently had occasion to mention the use of nail files to
trim the edges of a thin sawcut. I forgot to mention that I bought
several of those nail files sold as ‘sapphire’ coated. Well, depends
what you mean by sapphire, but the coating is extremely hard,
abrasive and durable, and probably is a corundum; aluminium oxide
crystals. I have ground some down to a width of two millimetres to
use when cleaning up pierced designs. The metal is well tempered
steel but when doing the grinding very great care has to be taken to
ensure it does not get hot; keep a basin of cold water beside the
grinder and dip the file very frequently. If the file gets blue,
just chuck it away; it will be useless. The files should be
obtainable from most pharmacies (or drug stores, I think you call
them) They are very cheap and worth while considering, especially
being slightly coarse on one side and fine on the other. – Cheers for

John Burgess; @John_Burgess2 of Mapua, Nelson NZ