  StringSpinner is a plugin for the introduction of the spin effects in the
hadronization part of the PYTHIA 8 event generator. The spin effects are
generated for pseudoscalar meson production by propagating the quark
polarization along the fragmentation chain according to the rules of the
quantum mechanical string+${}^3P_0$ model. By using parametrizations for the
transversity parton distribution functions, StringSpinner allows to simulate
the polarized semi inclusive deep inelastic scattering process on protons and
neutrons. The instructions to use StringSpinner and to modify the
parametrizations of the transversity distribution functions are presented, as
well as an example of the calculation of the Collins asymmetries as obtained
from simulations of the transversely polarized semi inclusive deep inelastic
scattering process.
