You just intonate using a strip of painter's tape for an edge. 1973 factory fretless P.
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Here's a production Fender Jaco Tribute fingerboard. All production fender fretless necks should be this way.
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What's interesting to me, looking at the '73 factory fretless Precision and the Jaco Tribute with the dots "on the note," is the double dot at the octave (12 position). On the P, 17 inches (the nominal octave placement) lines up with the first dot. On the Jaco, the dots straddle the octave (17" lies midway between them). The latter (dots straddling the octave) is how I am used to seeing it and expect it (and what makes sense to me) on an unlined fretless... but I think I've seen folks intonate those basses using the first dot as a reference (which would work out fine with the other dots if that is where the 17" half-way point lies, but would be off otherwise).
Which all goes to show that 1) even on this matter, there is not universal agreement in construction (dot-placement) or dot-interpretation, 2) in the higher register, where there's a fair bit of parallax (and especially if the intonation is set "off" because of some discrepancy between where the octave dot(s) actually are vs. where we think they are), people using the dots for visual reference (along with their aural, tactile, and kinesthetic references) are calibrating to their own instruments (which I guess happens in any case), and 3) I forget -- but it seems there should be a three.
So I think at this point we've learned that we agree to disagree, that fretless side dots are where they are, and that may vary by brand, model, year, etc. And most valuably, we have learned that we all have our own ideas about the correct location. It's clear by now that we all know where the dots are on our basses and that we all believe the dots on basses we don't own are in different places than they actually are.
Awesome. Here's another picture of the Jaco bass from Fender CS straight off the website. Note the dot position different from your attachment. All of these dots are not related to the note/fret, they are in fretted position, not fretless position. Hey, I'm not saying you are right or wrong. I'm pointing out this is inconsistent, there is no standard even at the Fender facility.
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Between the "on the lines" Jaco and the "between the lines" Jaco basses, I think I might have a slight preference for "on the lines" -- dot and note in the same place, for me, is less cluttered, less data to process (vs. here's the dot for the 7th position, and here's the 7th position, a little past it). On the other hand, it also makes the dots less distinct -- it's easier to quickly, visually "grab" the 7th position dot in-between the lines... maybe basses with lined necks and dots on the notes should have the dots be a little more visually distinct?
exactly! That is why that is the standard for lined fretless necks. Because 80% or more of the lined fretless basses have them placed that way. So that's why it can't be called wrong. Not much of a discussion I guess...
Something being common (or the most common way of doing things) doesn't, in and of itself, make it "right" or "wrong." In this case, though, the fact that a lot of fretless players are coming from playing fretted bass and/or, with lines, find it helpful to find the dots in the same places on their fretted and fretless instruments, is a compelling argument for having them in-between the lines (whether I prefer it or not). That might make it right for a bunch of players -- maybe even the majority of lined-fretless players -- which might make it the right configuration for Fender to default to -- but it doesn't make it right for everyone.
Tradition and how widespread the practice is among bass makers might contribute to people being more familiar with a thing, which would make it easier for them to latch onto, but the fact that it's widespread, in and of itself, doesn't prove that it's better or right.
If Fender were strongly convicted that one way or the other was inherently and substantially better, they could offer basses that way (say dots-on-the-line) and try to change "fretless dot culture..." but, yeah. You pick your battles. The less-popular option could always be an upcharge-option, but that would be a pain.
As far as lined basses go, I don't feel that passionately either way (I think I could adapt to either -- would depend on how much I liked the specific bass more than anything) and, as I said before, I think whatever a particular player finds most useful is what he or she should go with. I'd be willing to accept in-between as standard (though I might want on option for "on").
On unlined basses, again, whatever you find helpful, even if it's dots in-between the notes (even if that seems crazy to me -- which it does).
If in-between is standard for lined, I'd argue that on-the-note is (even moreso) standard for unlined -- definitely more widespread. (I seem to recall coming across an unlined fretless in the classifieds with dots in-between, and passing on it for that same reason -- someone's custom request? -- not for me -- though I can sort-of wrap my head around it -- but might be just the thing for someone else.)