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I would only do it after the standard cleaning methods. Yes, you don't let the nail go past the surface edge of the head itself. The actual head gap in the center of a single head is a real gap of a few microns (can't remember the number anymore but something like 25). The nail won't enter the gap. Most 4 head machines I saw were spaced 90 degrees but for the adjacent heads definitely don't cross from one to the next. I had that technique down like a science. Larry G
PS - maybe it was the hi-fi audio head that was offset 90 degrees. It was too many years ago ...
Last edited by retrogear; 12-29-2016 at 10:15 AM.
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