The Minelab Excalibur II metal detector was introduced in 2008 and is still in production as of today. It is a fully submersible multifrequency VLF metal detector aimed primarily at coin, jewelry, and saltwater beach detecting. It has a maximum depth of 200 feet, making it suitable for use while scuba diving.
Most people who metal detect will purchase a metal detector and just use the detector as it comes in the box. After time has passed and perhaps meeting another more seasoned metal detectorist, they will see a person using the same detector but modified with some sort of new metal detector shaft or a different pair of headphones.
The MInelab Excalibur II comes with an aluminum dive shaft and long shaft for scuba and beach metal detecting. So why am I writing about the Anderson carbon fiber straight shaft and the 24-inch shaft? If you are a tall person or a person who wants to cover more ground whether its in the water or dry sand then the Anderson carbon fiber shaft is for you. It allows you to have a wider swing with longer reach. This allows you to cover more ground and make more finds. The best and most important factor with the Anderson shaft is the fact that it counter balances the metal detector taking all the weight of the controller from your forearm and placing all the weight behind your elbow. This allows you more time on the beach with less stress on your arm and offers you the opportunity to cover more ground and stay out longer metal detecting. I personally have 3 Excalibur II metal detectors. I would never use the Excalibur II without modifying the detector shaft. Modification of the shaft has no bearing on your Minelab warranty but it will surely give you the opportunity to make more finds.