Let the Packout unit you are working on sit in the house for awhile if the temperature is below 72, and let the plstic warm up to room temperature. Stop at the Dollar Store and pickup a tube of super glue just in case. The plastic top gets brittle and will crack when you are removing the old tabs, if the unit has not been allowed to warm up. The super glue is a quick fix, but I wished it hadn't happened at all. The black vinyl top, when you are prying it away to release the tab, will discolor a ...