Don't know if any of ya'll are familiar with these tiny little things, but I'll put this out there anyway.
Dyna Beads are a product used to balance tires....from the inside. They come in a little plastic bag, and you can either insert them while mounting a new tire, or they can be installed thru the valve stem....yup, they're that tiny! And...they WORK. You no longer need to have nasty, ugly weights either taped on, or beat on with a hammer to your rims.
I learned of these things from my Goldwing forum buds...of course, most of ya'll know how skeptical I am of snake oil salesmen, so I dint pay too much attention to them. But recently, I had to put new tires on my Goldwing, so I decided to give the Dayna Beads a shot. They don't cost much at all, so it wouldn't be a big loss if they dint work.
They do....and they work really well. Unbelievably well.
They are also available for classic car tires....like our Sharks. They're not recommended for use in low profile tires, but for the original sized tire on the Shark cars, they will work. I plan on putting them in my '74 before I make another road trip in it.
Anyway, just wanted to share this wid youse guys. They have several set-ups to cover even 4X4 tires, big rig tires, regular car/truck, etc.

Check them out....

http://www.innovativebalancing.com/index.php

 I use them in all of my Motorcycles, love'em  I haven't tried them in any of my Cars.