My method uses loops as the weft, one originating from a ball of yarn
stationed to the left of warp, the other originating from a ball of yarn
stationed to the right of the warp secured at the selvages by interlacing with
one another.
The example described below creates a tabby weave scarf on a four-shaft loom
with a 10 sett epi. The yarn is passed from side-to-side by hand because the warp
is narrow but an tool can be used for traversing a wider warp.