Typing Technique and Typewriter Design by [[Will Davis]] and [[Dave Davis]]

As early as 1932 Royal salesmen would use poor typing technique on purpose to cause skipping and piling and then use proper technique on their own machine to show how much better their typewriters were compared to the others.

Some repair and service manuals had sections about tuning a typewriter to the level of technique of the user. These may have included 5-6 specific adjustments for allowance to a particular user's technique, as an example indicated in this video.

"pounded out" - used by a heavy handed typist and now skipping (mentioned possibly in an Ames Repair Manual)

In the mid-century, the service life of a standard machine was 1-3 years of continual (heavy) use. After this it would have been remanufactured or swapped out.