If you wish to extend the bore depth of the cotton bud you could glue it on to a thin knitting needle or a length of 1/16" welding rod. I wrap the end of a 1/8" welding rod with cotton that I seal with shellac varnish to stop it from un-wrapping and use this for oiling and also french polishing the bore to get a really good smooth shiny bore that improves the tone enormously. Colin R.
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