There were questions about shaving a neck here recently. After getting my ESP/GrassRoots BassIV with it's V-profile neck (and really digging it) I thought I'd do that profile on my Glam PJ.
Here's a short step-by-step on how I did it.
I used my contour gauge to determine both profiles at 1/2 way between the nut and the 1st fret. I was surprised at how little difference there was. It reminded me that our left-hand "feel" is very sensitive to minute differences. So as much as it's a V profile - it's a soft V - but still very noticeable.
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Here's the contour guage impression of the Bass IV - right side is off but incrementally so... it's only so accurate. Still looks 'U' but it slopes from the crest subtly as the illustration above shows.
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I cut a guide out of scrap wood as the contour guide moves. Plus, it didn't scar the wood as metal tangs would.
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Still a bit off - I used a combination of flat-blades and sand-paper (P50 & 120) and checked often for progress. When flat-blading, I made sure to do broad passes down the neck to keep the transition smooth.
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The contour gauge on the BassIV -
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...and on the Glam PJ - sorted! I didn't take pics of the GPJ before - but it was a more rounded "baseball-bat" profile. Once the desired soft V profile was achieved I did the 220 sanding, and a few wipe-on satin poly coats. (which is how I treated it originally years ago) It is an AllParts Fender Authorized 1 piece maple J neck. I only focused on the first position area because that's where I noticed the different the most.
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Hope this helps anyone wondering if they themselves can fine-tune their necks. As long as you are patient and cross-check as you're doing it - it's possible and frankly having your neck be the way you like it is huge. For me it makes or breaks a bass.
We'll soon find out from @BklynKen
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