Glass Repair and Vacuum Pumps

It was years ago. The question popped up on r.a.h
How to make a low cost vacuum pump.
I remembered this when talking to my son today.
He was fixing a spider web chip on his windshield.
He mentioned the thumbtack, the double sided adhesive gasket, the
funnel cap. The syringe and the UV acrylic.
Syringe? I needed to fix a chip too, so I bought a kit (around $10)
And there it was: the 5 or 10 cc throw away syringe, with the x cross
section stem, with two notches on it, and a spring to register in either
notch.

This kit looked like the work of an engineer. The most utility for the
least cost.
First apply the acrylic liquid - in the shade, then apply the syringe,
pulling the plunger out into the notch, to apply 10 minutes of suck.
Then release the syringe, and push the plunger into the other notch, to
apply 20 minutes of blow, then remove the gadgets, and let the acrylic
cook in UV.

Such a neat use of a syringe. That's the kind of idea Jim could have
used then. Come to think of it - maybe he DID. For checking a pressure
sensor, or some such.

Brian W. Altus OK