I'm using my cue butt which has a 3/8x10 pin, I own like 4 identical custom butts with that pin, all of them are the same, and I've used many shafts over the years on this same butt.
These custom cues are made by a well known cue maker and they are all fine, I say fine because Ive changed shafts over the years and all of them fit very well.
I've used
1) his own custom shaft.
2) Mezz hybrid pro II (2 shafts)
3) Universal Shaft (3 shafts)
4) Mezz Alpha (3 shafts)
All of these shafts are straight singled, and also straight when put together with the cue.
To the person above me, this is why I thought it's with the tiger shaft and not the cue, but now as I'm reading to the other replies, I'm not sure about the chamfer, but If you guys mean by this the tightness of the thread inside the shaft, then I can tell you that the tiger shafts that I received both of them are pretty tight, they roll straight singled, but once I put them together with the cue they wabble. But the thing is, at the last few scrolls while i'm putting the cue together with the tiger shafts, they are pretty tight and need hard muscle to lockdown, is this the reason why they wabble? As I understood some of the replies, that might be it? So to fix this, I need to enlarge the thread inside the shaft, is that what you guys are saying? Thanks.
By the way the tiger shafts that I got are two different shafts, one is Ultra-X and other one is Ultra-X LD. both are tight during the end when putting the cue together.