I did not like that this item is for 'new construction' and cannot be easily converted for 'existing or old' work (prefab drywall/plaster). It is understood that the "tongue” must be cut off to pick up the "existing” work. Not this case. The tab should not be torn off. In order to work it on my existing one and not damage it I had to put the piece in a miter saw and cut off the tongue. Then I could get it to work.
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