And again, I link back to that other forum.
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I'm a relative noob on thickness of Ric necks. Also, there's a lot of mixups in this discussion between what I call neck thickness (from the top of the fretboard to the back of the neck) and width (from the top of the fretboard near the fat string across to the bottom of the fretboard near the skinny string). Terminology seems to be problematic in discussing this as some people use the term "width" interchangably.
All I have to go by is my 4003S/5 and what I sorta recall about my late 80s/early 90s 4003--which I never compared to another Ric before selling it.
I don't think the 'width' has ever changed. The width of the nut and neck have been the same for many years. I agree, some people confuse neck 'width' with neck 'thickness.' If Rick changed the 'width' they'd have to alter the nut and frets as well. I don't believe that's been the case in recent history (30 years or so).
The ''thickness' of the neck (from the top of the fingerboard to the back of the neck) seems to vary every so many years. And I believe it's deliberate and extends beyond the variance in the person that sands it down prior to finishing.
The necks on my C64 4001 (single piece construction) are much thinner than the one on my 1982 4003 (two piece - laminated), which is thinner than the neck on my Jan 2009 4003 (single piece construction), which is the meatest neck of any bass in my possession. And I love it!



