Method of manufacturing spectacle arms

A method of manufacturing spectacle arms, comprising:

• grooving an inner face of a first cover plate, so as to form a plurality of grooves in said inner face, wherein the several grooves extend parallel and are spaced apart one after the other;
• providing a gauge comprising:
• a plurality of longilineal inserts extending parallel and spaced apart one after the other and having respective front ends and rear ends;
• a front bridge joining the front ends of the longilineal inserts and having front indexing means disposed between the longilineal inserts;
• a rear bridge joining the rear ends of the longilineal inserts and having rear indexing means disposed between the longilineal inserts;
• setting the gauge on the inner face of the first cover plate so that the longilineal inserts are disposed inside the grooves and that the front bridge and the rear bridge protrude from the first cover plate;
• pressing and bonding a second cover plate on the inner face of the first cover plate so that the longilineal inserts are inserted between the first cover plate and the second cover plate and that the front bridge and the rear bridge protrude from the first cover plate and the second cover plate;
• and
• cutting the first cover plate and the second cover plate with a cutting tool around the longilineal inserts in order to form spectacle arms, wherein the cutting tool prior to cutting around a longilineal insert is positioned and held in place with respect to said longilineal insert by cooperating with front indexing and rear indexing adjacent to said longilineal insert.