Grommet be used purely decoratively for crafting. When used in sailing and various other applications, they are called cringles. Sometimes field workers refer to them as grunyons. If metal or another hard material has a hole made in it, the hole will probably have sharp edges. Electrical wires, cord, rope, lacings, or other soft vulnerable material passing through the hole can become abraded or cut, or electrical insulation may break due to repeated flexing at the exit point. Rubber, plastic or plastic coated metal grommets are used to avoid this. The grommet could also protect the wiring/cabling from contamination from dirt,
A Katy or a Gaga began recording songs and rehearsing dance numbers for the episode in the middle of the preceding week. Adam Lambert debuts in this episode in the recurring role of Elliott "Starchild" Gilbert. According to Chris Colfer, who plays Kurt, Lambert's character will be Kurt's nemesis. Late on September 26, Lea Michele tweeted a photo from the set featuring herself, Lambert, Colfer, Naya Rivera and Demi Lovato singing in front of a band. Special guest star Lovato returns as Dani, Santana's fellow waitress and girlfriend. Other recurring characters in this episode include cheerleaders Becky Jackson (Lauren Potter) and Bree (Erinn Westbrook), and