  A spring-mass model arranged in a diamond structure --- mechanical diamond
--- is analyzed in terms of topology in detail. We find that, additional
springs connecting the next-nearest-neighbor pairs of mass points and the
modulation of the mass parameters to the pristine mechanical diamond generates
multiple pairs of Weyl points in the frequency dispersion. Evolution of the
Weyl point positions in the Brillouin zone against the uniform outward tension
is tracked and explained by the point group symmetry, especially tetrahedral
symmetry of the NNN springs. Interestingly, there happens a rapid transmutation
of the monopole charges of the Weyl points as the tension varies. We also show
surface Fermi arcs in the case with anisotropy in the NNN springs.
