No, a 12mm tunnel does not grow back together on its own. Once a tunnel or piercing reaches a certain size, the tissue does not have the ability to naturally close up and heal completely. If someone with a 12mm tunnel wants it to close, they would likely need to undergo a surgical procedure to remove the excess tissue and allow the hole to heal. **

The choice between a 10mm or 12mm tunnel ultimately depends on your personal preference and the look you are trying to achieve. A 10mm tunnel may be more subtle and suitable for everyday wear, while a 12mm tunnel will be slightly larger and more noticeable. Consider the size of your earlobes and how comfortable you are with a larger size before making your decision. **

Yes, there is a Samyang 12mm lens without autofocus. The Samyang 12mm f/2.0 NCS CS lens is a manual focus lens designed for mirrorless cameras. It is known for its wide-angle perspective and fast aperture, making it a popular choice for landscape and astrophotography. While it lacks autofocus, it offers excellent image quality and is favored by many photographers for its sharpness and compact size. **

To stretch an ear piercing to 12mm, it's important to do so gradually and safely to avoid injury. Start by allowing your piercing to fully heal before attempting to stretch it. Then, gradually increase the size of your jewelry over time, typically waiting at least 4-6 weeks between each stretch. Use lubricant and taper tools specifically designed for stretching piercings to help ease the process. It's important to listen to your body and not force the stretch if you experience pain or resistance. Consulting with a professional piercer can also provide valuable guidance and assistance throughout the stretching process. **

No, a 10mm hole is not sufficient for a 12mm dowel. The hole should be slightly larger than the dowel to allow for easy insertion and a secure fit. In this case, a 12mm hole would be the appropriate size for a 12mm dowel. Using a smaller hole could result in a tight fit or even damage to the dowel during insertion. **

To make a 12mm tunnel close up again, you can gradually downsize your jewelry by wearing smaller gauge plugs or tunnels. This will allow the skin to shrink over time. Additionally, massaging the area with vitamin E oil or a gentle, fragrance-free lotion can help improve skin elasticity and promote healing. It's important to be patient and consistent with these methods to allow the skin to naturally tighten and close up the tunnel. **

Stretching a nose piercing from 1mm to 12mm is a significant jump and should be done gradually to avoid injury. Start by waiting at least 6-8 weeks after getting the initial piercing to allow it to heal completely. Then, gradually increase the size of the jewelry every 4-6 weeks by 1mm increments using tapers or insertion pins specifically designed for stretching piercings. It's important to listen to your body and not force the stretch if you experience pain or resistance. Additionally, make sure to keep the area clean and moisturized throughout the stretching process to prevent infection. **

The default settings for the Mikuni 12mm carburetor are typically a 0.2mm float height, a 15 pilot jet, and a 70 main jet. These settings are a good starting point for tuning the carburetor for optimal performance. However, it's important to note that the specific settings may vary depending on the specific application and engine setup. It's always recommended to consult the manufacturer's guidelines or a professional mechanic for the best tuning advice. **