Convert from shaftment to cuadra [Argentina]

Unit Definition (shaftment)
A shaftment, when used as a unit of length, is usually six inches or two palms, i.e. 15.24 cm (for the international inch). It is thought to be the distance from the tip of the outstretched thumb to the other side of the palm.In English this unit has mostly fallen out of use, as do others based on the human arm: digit (1/8 shaftment), finger (7/48 shaftment), palm (½ shaftment) hand (2/3 shaftment), span (1½ shaftments), cubit (3 shaftments) and ell (7½ shaftments).

Unit Definition (cuadra [Argentina])
In Argentina and Chile, the cuadra is equal to 150 varas (roughly 130 meters or 410 feet). Elsewhere in south and central america, the cuadra is equal to 100 varas.