What are you going to do with the extra space on the bridge pickup. If you can design the ramp around your pickups I’ll 3D print for you I’ll need the stl file.
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The difference should be just 2.5mm per side!
As I will mod my black “punk” Ronin, I don’t care too much.
Another option would be to just get a frame - like you suggested - but I’m still looking for the right sized product.
Something like this:
Thanks for the 3d print offer, but that would be too complicated and take too long!
Also, cause @Wombat-metal had this really phantastic idea with the red pickups, I will get some glowing Ferrari Red vinyl sheet to coat the big Humbucker pickups.
It should look absolutely amazing on the otherwise deep black Ronin bass!?
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yeah red looks great
My Kala Ubass will get red pickup and black hardware overhaul very soon, the bridge is coming in today. Got my strings, pickups and tuners already.
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I was all black-minded before, cause “Schwarz ist bunt genug!” & black basses matter!
But that red “in yer face” accent is great. Look at your black bass … can’t ignore it.
I’m in love 
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I think I have a cool idea for the placement of the humbucker pickups. PU positioning seems to be a science in itself.
True to the motto “It’s better to steal well than to invent badly”, I use a shortscale as a model that I really like: the Spector Bantam 4.
This is what it looks like (position measured from fret 12):
When I project the Bantam pickups onto the HB, it looks like this:
You can see that I have to move the bridge position to the left so that I don’t have any ugly cavities. That’s OK.
The neck/middle position would actually fit.
BUT… I’m going to do the following:
Bridge PU moves to the left.
For the neck/middle PU, I have a larger cavity routed, so that I can freely move the positions to the left or right, about as wide as the two Precision PUs.
This way I can test out different positions before I commit.
And if I like it: make a pickguard that fits and… YAY!
@Al1885 ? @Wombat-metal ?
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Seems complicated. How about 3 pickups and a 5 way switch? then they wouldn’t have to shift and you get more options
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I was thinking about it … but even I found that too crazy. I mean, there are limits, right? Are there ???
With the 2 humbuckers closer together it gives you a different sets of tone altogether very robust tone. While it’s not the mode I want to be in all the time but I really love my Double Bucks setup. It’s like Stingrays on steroids, a super Seiyan stingray. 
Be aware and ready for some twang with the bridge pickup closer to the bridge.
I can’t want to hear what you think if it.
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So, I cannot really move the bridge Humbucker higher or lower, as it needs to overlap with the old Jazz cavity. It looks like it is not as far from the bridge as on your basses, but that’s ok.
The magic is in moving the neck/center Humbucker. I can get quite close to the bridge PU … or further away.
Move, test/play, move, test/play, move, test/play … that would be the plan.
Does that idea sound reasonable?
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Since you are going to do the pickguard, you can do the big one that covers the both pickups. Or cover almost the entire front. Here’s the idea
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In fact I could … but the body top is not flat at the left upper side.
I’ll just go for it. Mainly as I don’t have enough patience and can’t wait to play it
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Just put a design to it large enough to cover both and you can route the bathtub cavity and you can move it anywhere you please.
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Exactly - also, it’s kind of semi hollow this way
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The correct term would be Chambered, 
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Wow! I will have made a chambered bass?! Kewl
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Beware that big holes under a plastic guard makes very bad accoustic resonnances.
Otherwise I quite like a big perloid guard (but not over big holes).
Is this serious?
Can you explain? Tomorrow is routing day … need to decide until then!
It’s simply that you create a resonance table like on an acoustic guitar, but it’s a plastic plate so it resonnates like … plastic. It just sounds like plastic, there is no other word.
I’ve already made this mistakes on a few guitars before I understand the phenomenon.
It does not really makes a difference when playing plugged into an amp, but the acoustic resonnance is just really bad.
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Ah … thanks!
And if I put some firm foam under it, that’s really tight between body and pickguard??! No resonance!
@terb - what do you think about that?
I don’t think that resonance is bad, I think that bad resonance is bad 
I would just avoid routing big holes under the pickguard.
On Fender Stratocaster’s there are different routing, including the original SSS one :
and the “swimming pool” one with only one big hole to fit any pickup configuration :
I have both and I can tell this makes a big difference about the acoustic resonance. Many smaller holes are better under a plastic pickguard in my opinion. It’s not the case when the “cover” of the holes is wood, obviously, for example a Thinline Telecaster or a 335.
So, yeah, I would just avoid routing big holes under a plastic pickguard.
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