Hello everyone, hey bbb
some good responses here (for me)- i like what Fran and Scott wrote. You cannot act here "in one specific" way. it s too complicated and many things could have influence on the outcome.
When i see or identify, that the student has a problem with finding the striking line /line of sight- then it s time to FIRST find out, where he s seeing the "straight line" ....WITHOUT A CUE.
For this i still use something a worldclass snooker player showed me in the 80 s when i was in London. Nowadays they call it the "sight right" method- and they make a bunch of money with it...lol-- you can create helping aids yourself for a few bucks.
Laser technology also helps- but this then gets bit more expensive then- know some coaches who also use laser stuff to work on alignment stuff. Imo very helpful.
Ok- first i want to know how the student has his head (in which position) when he s seeing a straight line. This happens on a pool (or snooker) table. Then i know usually, where the EYES have to be, so that the student sees the *straight line*.
After that he will get his cue- and has to try to get again on this straight line into his stance--- to see if eyes and cue are synchron on the line of sight/striking line.
sounds much easier than it is-- a habit burned in over years is tough to *let go* again. Also because most of the time the player has burned in also *corrections* to get a better outcome or result-- without knowing. He s doin it unconcsiously.
Just a short description- as Fran and Scott said- there is not "one rule" to attack such problems. To many factors have influence - or could be the reason.
An expirienced coach, with good observation skills is here in my humble opinion a must.
And what i can asure you--- this can be a pain in the ass most of the time, to get there, where you want to be

Had this a few times- and just 2 out of 5 persons made it finally-- the others just gave up, because they immediatley saw, how much work it costs- and how uncomfortable the practice sessions on this topic really are.
Even if i told everyone, "this will be brutal maybe..."...almost everyone says first: no problem i want that

...and after a few sessions they give up.
no reason to talk around the cake around....it needs discipiine, dedication and hard work to fix such problems. it s not the nicest problem you can have....and to solve it
kind regards, and a smooth stroke to everyone.