Right - Basically, I wanna know if there's an alternative to my knobs:

These are the type of knobs which I have on both my main guitars, and I absolutely love the look and feel of both of them - But they're held to the pot by a little screw which seems loose all the time!
Now, this isn't such a problem on the Viper, since it rarely gets so loose that turning it stops turning the pot (but it does happen, and out comes the screwdriver).
But on the Horizon - The volume is a push/push for the pickups, which I use alot - And as the screw loosens as it does on the viper, this becomes a problem, since every time I push to coiltap, the knob drops down a bit with the pushing force, and then it reaches a point where I can't push again to change back! And then outcomes the screwdriver again!!!
So basically - What options do I have? Are there knobs with the same look and texture but with a better mechanism? And if not, what possibilities are there to avoid these problems? I'd hate to change them considering they look so good - But it is getting annoying.