Walter,
Thanks for all of the information and replies. I do not take anything that you have to say as rude but, manual peening is a peening operation and utilizes nozzles. I think that a lot of folks are interpreting it the same way. Manual peening being allowed that is. I have never even considered (until this forum) that manual peening was not allowed. If a specification is "supposed to mean" something specific one would think that it would be specific about that issue. Thanks for the idea of a Quality Procedure/Work Instruction, that is probably the quickest, easiest and cleanest way to accomplish this.

Why would controlled, documented manual peening (in inaccessable areas) not be allowed in the first place?