This indicator back moves in and out easily with the use of a small Allen wrench. It will work perfectly for you!
The original red cardboard protective box has done a very good job of protecting this tool. It has some wear on it from doing its job.
It is still very solid and will continue to protect your tool for many years to come. Please look at all of the photographs as they can help describe the condition of this adjustable indicator back much better than I can. This American made tool is ready to go to work immediately and would make a great addition to any precision toolbox.