30% is more than a few.1991 during a TexasExpress event. 16cues were tried by over 50 players, 800 test hits. 70% could not identify the joint in the cues they hit. If they did this same test with varying construction methods the results would be the same. Few if any would identify the build method by the hit/feel.
I don't wish to kick a dead horse, but it's a proven fact there are those among us w superior tactile awareness. Otherwise there'd be no fighter pilots, whiskey sommoliers, or parfumnistas. There are those among us mere mortals more sensitive to everything. That's how blind people learn braille. Developing the part of the brain that deals with spatial and tactile recognition. Certain musicians, even old pool players who can stop that cue ball in a 2" circle every time, where most are happy being within a diamond.
I'm confident in the fact I can tell which joint a cue has in a blind test. I'll put my money where my mouth is. I'm not the only one. It has a lot to do with when you started playing and the variety of joints were slim. You got used to how certain pins and joint materials hit real quick.
You'd better or it could cost you money!!!
I'm out.