Evaluate the area you are hunting and if it has never been re-sodded, you shouldn't HAVE to plug. Pinpoint the target and gently lift the target from the soil with your probe. I've detected all over the country, including Alaska, and have found that coins and jewelry will be about the depth of the grass roots.......no deeper IF the ground has not had new dirt fill or sod put into place. My oldest coins were IN the grass roots. An old tax token was found at about 4 inches in a low area that had fill brought in by rain runoff through the years.
If you think your target is 4" to 6" deep, try locating the object FIRST with your probe and then cutting a slice in the dirt and reaching into the slice with a pair of long nosed pliers or a hemostat to grip the object. I've used the needle nosed pliers technique and wrapped the nose pieces with electrical tape or duct tape to prevent damage to the target.
I stopped watching that T.V. program called Diggers because those guys are amateurs. They cut big plugs in every recovery. I was almost cringing everytime they made a recovery. They were digging huge plugs in the front lawns of some fine old houses in New Orleans and other historical homes. They were finding good stuff, but I'll bet you the people at those homes would never let them come back after seeing the large areas of dead grass that would show up after a couple of days.