2001 Recon clutch adjuster

The threads on the inner screw must be bad above the jam nut because the jam nut will not back off at all, so I want to change it all out. It stays tight no matter how far i turn it.
I have the cover off but the stupid thing just stays snug and spins. I did get the inner part to back off and get out of the way, but I dont want to mess any threads in the cover up by just wailing on it with the impact gun trying to back it out. Does the alloy cover even have the threads for this or can I just let the impact gun run for a while and see what happens? Would it press out?

A