Operators on $C(\omega^\alpha)$ which do not preserve $C(\omega^\alpha)$

It is shown that if $\alpha ,\zeta$ are ordinals such that $1\leq \zeta <\alpha <\zeta \omega ,$ then there is an operator from $C(\omega ^{\omega ^\alpha })$ onto itself such that if $Y$ is a subspace of $C(\omega ^{\omega ^\alpha })$ which is isomorphic to $C(\omega ^{\omega ^\alpha })$ $,$ then the operator is not an isomorphism on $Y.$ This contrasts with a result of J. Bourgain that implies that there are uncountably many ordinals $\alpha$ for which any operator from $C(\omega ^{\omega ^\alpha })$ onto itself there is a subspace of $C(\omega ^{\omega ^\alpha })$ which is isomorphic to $$ on which the operator is an isomorphism.