No idea what they were doing or dirty machine is the only explanation
Keep repeating if you like the result.
Once a quality machine/proper technique is used you will never clean by hand again. Never.
How can 1-15 or back pocket 9 ball be played? Or maybe play a front and side. What front? Any banking vids available? Add a windmill and play miniature golf?
Nothing wrong with S's.. The only thing is the joint diameter...there is a noticeable lip if using an aftermarket shaft (REVO)...but not deal breaker. These are over 10 years old.... I mean new.... Closets queens.
It's the brass threaded piece that fits into the slide base... Too much play there. I also have a Micro ll Hightower that is solid with no play. I do not mind replacing the cross slide if need be. Something if definitely not right