Is anyone familiar with the Vicmarc VM150 and VM120 Chucks and the ability to turn in reverse? I'm considering purchasing one or both of them and I saw on the Vicmarc website that there is a Safety Ring that is used to lock the VM150 chuck while turning in reverse. If that is the case, is it required also for the VM120. The Vicmarc website should provide more information, but like many companies today they are more interested in the "Add To Cart" box. Any help will be appreciated.