A small, flat and elongated tool is provided, with a hook at its distal end, for inserting between stitches and sliding under the threads of a serged sewing seam. The tool, held between the thumb and finger of a user, is effective to grab the tail threads from the serger seam and to pull them back into the seam.

The presently disclosed subject matter is generally directed to a pre-threaded needle assembly that can be used in the hair weaving process. Particularly, the needle assembly comprises a base around which a portion of thread is wound. The base is operably connected to a needle that is used in the weaving process. The assembly therefore includes a base pre-wound with thread such that the assembly can be immediately used (as compared to prior art needles that must be hand wound before use). The disclosed assembly therefore is pre-wound to save time and effort. The needle can further be pre-attached to the base to save even more time.

A spar for an airfoil comprises a core, e.g. a foam core, a central structural member extending through the core, an outer structural layer surrounding the core and central structural member and a plurality of yarns extending through the central structural member.

A spar for an airfoil comprises a core, e.g. a foam core, a central structural member extending through the core, an outer structural layer surrounding the core and central structural member and a plurality of yarns extending through the central structural member.

A method for reinforcing a cellular material includes producing a through-hole in the cellular material that extends from a first surface of the cellular material to a second surface of the cellular material; reaching through the through-hole from the first surface of the cellular material to the second surface of the cellular material; taking hold of at least one fiber bundle at the second surface of the cellular material; and pulling the at least one fiber bundle into the through-hole in the cellular material. Producing the through-hole in the cellular material includes perforating the cellular material with a rotating and/or oscillating needle.