Product review (2 stars): With an older Dacor unit, these rings are extremely ...
With an older Dacor unit, these rings are extremely difficult to unscrew. This tool bent under the strain, and then would slip out of the slots, permanently destroying them. I had applied a rust penetrant before attempting to unscrew the rings, to no avail. I had to resort to a hammer and punch to get the ring off. Other manufacturers do not use this design.