Plastic valve stem cap(s) or reuse your old ones
Paper plate (optional)
As with all projects, read all of the instructions first, before proceeding to make your own.
Step 1: Prepare the head
Tape the head down to your work surface. We used a paper plate (and also a tray) so we could move the project to let it dry. Be sure to tape off the back of the head, to form a wall.
Tip: You could set the head in a lump of modeling clay, but be sure to still tape off the back of the head.
Step 2: Create a rig
You can make a simple rig by poking a pencil all the way through a soda can, near the top. Add water to the can, to make it heavier and stable.
This will give you something to suspend the cap from.
Step 3: Glue the cap in place
Push the plastic cap onto the end of a pencil, and push the cap into the latex caulk, just so that it is completely covered. Try not to let the caulk overflow, and cover the pencil.
Tape the pencil to the rig, to hold it in place, and allow the caulk to set/dry.
Step 4: Put it on your bike!
I have been designing products in the automotive, aerospace, medical, defense and consumer products industries for over 30 years. I am an "Inventor for Hire", so if there is something you need designed or built, just send me a message, or stop by http://www.lime3D.net, and maybe we can do business!