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Originally Posted by Uncle Bulgaria
Thank you, TIMTAPE. That PDF is very helpful, and the process appears understandable.
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It's great isn't it. Lots of practical information there.
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As far as this head goes, is the brass tripod screwed over the coils, with the hole to attach the head cover, part of the re-lapping process or do I remove it? I imagine the procedure is to sand down the whole of that front brass curved surface, but it's as well to check!
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Yes the entire face is lapped. Obviously the base would need to be temporarily removed. Just be careful with lapping, especially if it's the first time for you. A little bit at a time, with frequent visual inspection with a magnifier in a strong light. There's only so much metal there before the fine head gap opens out and then it's a bin job. Ideally practice your technique on something that's OK to destroy!
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Does the square (erase?) head need the same treatment, and if so does it need removing from its alloy case?
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I wouldn't attempt relapping the erase head. It has a ferrite core rather than permalloy and I believe special techniques were used to relap them.