I am going to buck the tide a bit and say the worst mistake I ever made in pool was trying to update my game after about twenty years mostly away. I came on AZB and the pendulum was all the rage. I am here to tell you all I had horrible flaws in my pendulum stroke. What I didn't realize is there wasn't a thing in the world wrong with my full arm stroke.
I got to where I was neither fish nor fowl, my stroke plain sucked trying to force it to be something it wasn't. Most of the time I never reached much over 50% of my old game. The only times I played well was when something caused me to just play pool, without thought. I was practicing on the only nine foot table in the town, small town. The table was old and very rough but the only one in town and I got a sweetheart deal on the table time. Because of these things I let anyone join me that wanted to.
A youngster came up with a cue case buried under all kind of league stickers and accomplishment patches and decals. We hit balls for an hour or so, then he wanted to play one set before he left. The same signs that have warned me for years said it was time to play pool or lose, I was seeing his best game. No doubt in my mind that his goal was to go away feeling good at my expense, nope! I started gliding around the table, the stick was started back as I set my feet. As soon as I hit the cue ball I was moving into the next shot. Two quick games and the youngster quit, he could see there would be no joy in Mudville that night!
If I had it all to do again I would have just let my old game come back. Now I am usually stuck betwixt and between. Of course forty years since my best game and more surgeries than I can remember haven't helped my game any!
With hindsight I wouldn't try to build something new until I was sure what was old was broken. I was taking pretty much anyone that came looking before I decided to fix my game.
Hu