These load spreaders are practically life savers for stringers and it is quite common for stringers to have it on their machine.
Some machines will probably need some adjustments to the original posts such as taking off some stock paddings to be able to fit these in.
Ever since I've got to know such spreaders are available, its a no brainer that you've absolutely got to get them. Rackets go through tremendous stresses when they are strung and these spreaders protect the racket that you are stringing and ultimately your pocket (if you do break any racket).