Yo need to practice step by step to get a full followthrough.

Get out to the range and start by simply hitting half shots. Club goes back 1/4 way, club goes through 1/4 way. Hit about 40 balls like that and move on to 1/2 shots and repeat. Once you feel comfortable and the feeling is natural, move on to 3/4 shots and repeat. Keep a nice easy tempo and smooth swing. Don't worry about where the ball is going (for now) that is not the purpose of the drill. You are trying to get your full motion in your followthrough whiole hitting the ball. Finally finish the drill with full shots. If at any point you feel that the next step is too awkward, move back to the step before.

If this doesn't see to be working, get a video camera and take a video of yourself hitting the ball with your abbreviated backswing. Maybe you can see what is holding you back. Your actual swing is very rarely the same as your mental image of your swing and you will notice exactly the difference between what you want to do and what you are actually doing.

If you still can't get over the hump, post a video here and there are many on this site that will give positive feedback on how to solve your problem.

__________________
Gord

Quote of the month:
"It's easy to see golf not as a game at all but as some whey-faced, nineteenth-century Presbyterian minister's fever dream of exorcism achieved through ritual and self-mortification." ~Bruce McCall