Securing an internal assembly within a tool

A collecting tool, comprising:

• a substantially tubular body defining an axial bore, wherein the bore is configured to have a drilling fluid flow therethrough;
• an internal assembly configured to be positioned at least partially within the bore, wherein the internal assembly comprises a magnet holder and a plurality of magnets positioned at least partially within the magnet holder, wherein the magnets are configured to attract magnetic debris in the drilling fluid;
• a collet configured to be positioned at least partially within the bore and axially-adjacent to the internal assembly, wherein the collet comprises a plurality of fingers that are circumferentially-offset from one another, wherein at least one of the fingers comprises a protrusion that extends radially-outward and is configured to be positioned at least partially within a recess formed in an inner surface of the body to secure the collet in place with respect to the body, and wherein the collet further comprises inner threads on an inner surface thereof;
• and
• a collet pin configured to be positioned at least partially within the bore, axially-adjacent to the internal assembly, and at least partially within the collet, wherein the collet pin comprises outer threads on an outer surface thereof that are configured to engage the inner threads of the collet to secure the collet pin in place with respect to the collet, and wherein the collet pin is configured to contact the internal assembly to secure the internal assembly in place within the body,
• wherein the collecting tool is configured to receive the drilling fluid from a drill string and to discharge the drilling fluid to a bottom hole assembly,
• wherein the collet and the collet pin are at least partially concentric with one another and positioned upstream from the internal assembly in the bore, and
• wherein the fingers are positioned proximate to a first axial end of the collet, wherein the collet further comprises a plurality of circumferentially-offset teeth proximate to a second axial end of the collet, and wherein the teeth are configured to be engaged by a collet tool to substantially prevent the collet from rotating when the outer threads of the collet pin are engaged with the inner threads of the collet.

A method, comprising:

• inserting an internal assembly into a body of a tool;
• inserting a collet into the body, wherein the collet is positioned axially-adjacent to the internal assembly, and wherein a protrusion on the collet is positioned at least partially within a recess in an inner surface of the body to secure the collet in place within the body;
• inserting a collet pin into the body, wherein the collet pin is positioned axially-adjacent to the internal assembly and at least partially within the collet;
• inserting a collet tool at least partially into the body;
• engaging the collet with the collet tool;
• inserting a collet pin tool at least partially into the body, wherein inserting the collet pin tool at least partially into the body comprises inserting the collet pin tool through the collet tool;
• engaging the collet pin with the collet pin tool;
• and
• connecting the collet pin to the collet, using the collet tool and the collet pin tool, to secure the collet pin in place within the body.