  We revisit the large instanton contribution to the gluon Pauli form factor of
the constituent quark noted by Kochelev. We check that it contributes sizably
to the single spin asymmetry in polarized $p_\uparrow p \rightarrow \pi X$. We
use it to predict a large double spin asymmetry in doubly polarized $p_\uparrow
p_\uparrow\rightarrow \pi \pi X$.
