A new 'consider-this'
Here's why perfectly straight don't matter.
Imagine yourself down on the table addressing your shot.
Where are your hands?
One is within 6-10" of the ferrule and the other is about at the butt-end of the cue.
That unsupported length of cue in the middle is curved downward under it's own weight.
Let's add a 2oz stainless joint collar and insert system for good measure right in the middle.
As you start your stroke, several things happen.
The length btwn your hands is now varying, and so is the arch of the cue.
As a result, the tip is going up and down. This is assuming you're a robot and have a perfect stroke.
These two things are gospel in pool; no one builds a perfect cue and no one has a perfect stroke.
So does a credit card worth of shaft wobble while rolling on the table really matter?
What it comes down to is how well you can work with what you've got.
The cue should be the least of your worries unless there's truly something wrong with it.
If you keep looking for things to find fault with, you're going to find them.
Don't do that to your head and certainly not to your game. It's just one more easy excuse for losing.
Is there a fault with the cue? Yes, it's not perfect but then what is? I've never seen a perfect cue.
Let me give you a little psychological insight into a builder; we strive for perfection.
Even though knowing that we can never attain it. By definition, it's a form of insanity.
I'll venture to guess that your builder put his heart & soul into your build.
You made your decision when you selected him and I'm sure you made a good thoughtful choice.
Now's not really a good time to be questioning his craftsmanship, not in public anyway.
If my diagnosis is correct, you have a facing off by 1/2 thou. (.0005") or less.
It's an easy thing to adjust and just as easy to ignore. You wouldn't believe how common it is.
Trust me, it's not going to affect your game. If it's going to play on you that much, have it fixed.
HTHs, KJ