I'll call this fundamentals as opposed to an aiming "system", as it is more about what to do after finding the aim line. This is how I was taught early on from a local instructor.
First, you must be familiar with ghost-ball, and able to find that spot. (One method is to stand behind the object ball in line with the pocket. Note where the ghost-ball is. Now walk behind the cue-ball, keeping note where the ghost-ball is.) Lay the tip of your cue on the table directly behind center cue ball on this line. Keep your back hand under the cue, fingers near or on the table. Standing behind the cue, bend down and eye-ball the line, be certain your cue is perfectly on it. Now without moving the cue side-to-side, slide into the shot placing the bridge hand under the cue. (That takes practice.) You are now in shot alignment. If you stroke straight, you should hit the ghost-ball dead. This is the time to apply back-hand english to the shot, if spin is required.
There are other fundamentals assumed here, such as foot and body placement. The emphasis is getting the cue stick on the shot line first, then stepping into it. I apply this technique often times when I'm on a tough shot, or if I'm having an off-day and just need focus.
First, you must be familiar with ghost-ball, and able to find that spot. (One method is to stand behind the object ball in line with the pocket. Note where the ghost-ball is. Now walk behind the cue-ball, keeping note where the ghost-ball is.) Lay the tip of your cue on the table directly behind center cue ball on this line. Keep your back hand under the cue, fingers near or on the table. Standing behind the cue, bend down and eye-ball the line, be certain your cue is perfectly on it. Now without moving the cue side-to-side, slide into the shot placing the bridge hand under the cue. (That takes practice.) You are now in shot alignment. If you stroke straight, you should hit the ghost-ball dead. This is the time to apply back-hand english to the shot, if spin is required.
There are other fundamentals assumed here, such as foot and body placement. The emphasis is getting the cue stick on the shot line first, then stepping into it. I apply this technique often times when I'm on a tough shot, or if I'm having an off-day and just need focus.