Based on Erica’s favorable review in this thread:
I ordered this kit:
I wanted to install through the valve stems rather than dismounting the tires.
The glass beads look to be about .03" and a valve stem opening (once the valve is removed) is .125" so it is easy for the beads to clog if counter-measures aren’t taken.
I read & tried several techniques. In the end, here is what worked for me.
I placed a Harbor Freight Triangle Detail Sander wrapped in a towel on the wheel and touching the rubber valve stem:
I made a tool from a bit of wiper blade stiffener and sharpened it to a point to unclog any log jams. A length of stiff wire may be just as good.
Now it’s ready to fill. They provide the tube and the bottle, the beads are fed slowly into the tube. Squeezing the bottle is neither necessary nor helpful.
If you do not rush, the beads will not jam but if they do then the tool is inserted and twiddled until things free up and flow:
If you take it slow it goes faster (no log jams) and you can get all 4 oz in there in under 5 minutes.
A test ride indicated to me that the tires were well balanced and the tiny but pesky vibration I was getting at 50-60 mph was gone.