For the record, I am not a cue maker and I don't suggest that I know more than most cue builders.
But I liked your questions and will put my $.02 in.
I do compare LD shafts and non LD shafts. I use particular signature shots and aim and shoot the same way using the different shafts. I also compare LD shaft with other LD shafts. I also "test" cues of professional players and I ask them to shoot spin shots with cues other than their own.
Traditional solid maple shafts can be LD shafts. Like you mentioned, changing the ferrule material can change the LD properties. Changing the diameter of the solid maple shaft can do that as well.
I will keep an open mind about LD shafts being "in your head" but my personal experience is that LD helps me play better because I have to adjust less. I suppose that if I used less English I could play better to a certain extent. I own many traditional, solid maple shafts as well and have used them extensively.
I have also designed LD shafts with the help of another great cue maker who actually does the building of them. I use DymondWood, which is a relatively heavy and dense, laminated wood but turn them into LD shafts.
I also teach pool and one of my students who I have worked with off and on just had a significant boost in his confidence and his win/loss record. It happened because he purchased one of my LD DymondWood cues. And no, I don't have any LD DymondWood cues for sale. I only make about 3 per year because they are a real pain to build. I'm not trying to create a market for them and not trying to do a one-upsmanship thing, so I hope this post doesn't come off like that.
So in summary, yes I believe I can play better with LD shafts, especially with cue disciplines that require more mastery of spin shots.
Personally speaking, I don't believe LD properties are nearly as critical in games of rotation on 9 foot tables, although the European guys seem to do pretty well with LD shafts.
JoeyA
P.S. I believe REVO shafts are the way of the future for cue building (but I don't own one yet). I also believe that some players and cue builders will have to be dragged, kicking and screaming to come to this same conclusion. No disrespect intended. I respect strong, intelligent opinions based upon years of dedicated experience.
I understand the physics behind deflection quite well. What I do not understand is the quantification, the extent to which LD shafts change things from a normal shaft. Being a cue maker, I am aware of the significant spectrum in quality, spine, and density of solid maple. One maple shaft is not the same as every other. In fact, it's challenging to accurately match two shafts for a cue. Considering that LD shafts are also made of maple, albeit laminated, there will be the same inconsistencies. Indeed that is exactly what I have noticed with them. They range pretty dramatically in weight from one shaft to another, which by the very definition will cause inconsistencies from shaft to shaft concerning the LD properties.
Another thing often mentioned is ferrule length. Ferrule length is only a factor when there's only one way to install a ferrule & only one material to use. Only when you compare apples to apples does ferrule length factor. Case in point, and old fiber will be heavy where a newer thermo-plastic may weigh 25% less. If the thermo is a 1" ferrule with typical 5/16-18 install type, it will be a noticeably heavier ferrule than a 1/2" fiber with 3/8" straight slip fit. That's extreme ends of the spectrum with a zillion possibilities in-between.
So my point is, given that everybody understands what LD means, how does it translate to the table & with all the variables, who can be 100% sure the LD shaft they buy is actually lower deflection than the standard maple that came with the cue? How many people actually compare them in a head on, unbiased test? Furthermore, how much of the "LD makes you play better" is in the player's head? I'm not disputing the science behind LD. I'm only questioning how much the shaft shopper actually knows about the ever present variables, and to what degree it matters. It seems to be common accepted belief that LD labeled & marketed shafts are across the board lower deflection than standard maple, and I challenge that notion. How many people perceive themselves as playing better with LD shafts because they wholeheartedly believe they are supposed to?