Decided not to take a chance trying to force Dyna Beads through a 90-degree valve stem, so went go old school with traditional weights. After looking around at various wheel balancers, I wondered if I could whip one together myself. Here's what I came up with. It's very functional for less than $20.
chip

I love it.  American ingenuity at its best.  What did you use for the cones?

Fred

They're rubber shock absorber bushings from Napa Auto Parts. Cost $7.50.

If you have part numbers and a material list, that would help.

 

The “axel” is ½ inch, the wing nuts and hardware are to match. The rollers are drawer hardware from Ace Hardware. The part number for the shock absorber bushing is Napa 650-1100.

Relies on the wheel bearings being low enough friction. Are they?

I think a video of the OP inserting the Dynabeads through the 90, past the sensor would be a worthy project.

Shouldn't you have the tire on?

Nice and good workmanship.
I could use that on my wheelbarrow.

This is a slightly more expensive alternative:

http://www.harborfreight.com/motorcycle-wheel-balancing-stand-98488.html

Yes, the tire will need to be on. The bearings are those cheap little things you see along the sides of drawers like in a kitchen, and the weight of the wheel/tire are more than enough to get the thing to spin on and on forever. I will mount the tire tomorrow since my new 90-degree tire valves arrived today. Thanks to Murph!
chip

Good call on not using the DynaBeads.   

I saw that one from Harbor Freight. That was my second choice. I guess the $20 I saved will have to go toward frothy, hops-based libations.
chip

Here is a nice one from http://www.marcparnes.com

Here is a nice one from http://www.marcparnes.com

+1 

I stick a piece of threaded rod through the bearings and put it on a couple of jack stands. I can honestly say I have never noticed a tire being out of balance even if it was just put on and never checked.

I put my rear tire on the balancer today, and it didn't need a thing. Is that normal?

I have looked at the Dynabeads before but decided against them. How are they?

 

I have looked at the Dynabeads before but decided against them. How are they?

Great as long as they're mixed with synthetic diesel oil.