Where can I Have the Parallax adjusted On a Fixed Parallax scope?

I have done several over the years on various makes & models. On the scopes that do not have the obj. lens carrier glued it usually is easy. But recently I run into glued carriers and had to heat them, which could damage the scope. I recently sent to scopes to a scope repair shop , months of waiting to change a couple for me. They sent them back and said they could not do it. Depends on the manufacture. I never owned a Redfield but since that is an older scope, probably can be changed.