The process we use inhouse for fitting all of our factorysupplied Seymour Midwest replacement nibs to ready them for installation.

The long anvil used for truing the nib band is a blowhorn stake. Most people will not have access to one of these, but it makes the job easy! A length of black iron pipe in a sturdy vise may be used as an improvised standin, but is comparatively fiddly. Folks attempting such work themselves to tighten a loosened nib on an old snath will find careful blows to the shoulder of the loop will help keep the shape as distortionfree as possible.