Change 'rig' model during retopo

[system]

REtopologising a model using zsphere and retopology tool.
Although, got halfway through and realised a part (the belt) stuck out far too much for a low res topology.
After deciding to change the original (High poly) model, i went back to the half completed edit topo Zsphere, deleted the rig and attached the new rig

Unfortunately nothing changed, clicking delete rig didn’t seem to do anything, (except grey the delete rig button)

Is there any way to replace the base rig i’ve been working on so i can use this new model as reference instead?

Attachments

[system]

Finally worked it out, duplicated the subtool and clicked delete mesh in the rigging options.
(still unsure why deleting it from the original wouldn’t get rid of it, but either way problem solved eh?:D)