Constructing PVC Ejection Piston

Today I set out to create my PVC ejection piston. I've seen some online that required some sanding of couplings to get it to fit inside the cylinder and they also used an o-ring. They were also single use pistons.
I created this video below to document what I did today.

Material list:
- 8 inch length of 1" inch sch 40 pvc pipe.
- 8 inch
- Hot glue or clear silicone.
- 2 x1" inch PVC caps

1. Cut a PVC of 1" sch 40 PV, 8 inches long. This will be the cylinder for the piston.
2. I cut small ring (about 1/4 inch) from the piece that would become the cylinder.
3. Sand and roughen up the ends of the 1/2 inch PVC.
4. Use some WD-40 or cooking oil to lubricate the ring.
5. Squeeze some hot glue or clear silicone inside the ring, just enough to fill the ring and very slightly overflow. This I expect will become the piston head.
6. Insert piston arm into the glue. Use whatever means to make it stand 90 degrees upright.
7. Let it dry.
1. For the hot glue u can place it in the fridge to harden, but not before it sets.
2. Clear silicone should take 12 hours to cure.
8. Remove PVC ring. Give it a slight twist to help you.
9. Bore a 1 inch PVC end cap just big enough to accommodate bridge wire / e-match / ignitor.
10. Pull out excess wire wire, add some silicone to seal it off. 
11. Add a spoonful of kno3/sugar.
12. Cement end cap to cylinder
13. Add some grease on the piston and insert piston into cylinder.
14. Add  PVC cement on the cap and on the cylinder.
15. Insert cap over piston rod and over the cylinder to seal the cylinder.
16. Add 1/2 inch PVC cap over the free end of the piston rod.

*Clear Silicone can be used to form the piston plunger but it requires overnight curing. It is also weaker than the hot glue.

That's it for now

here is the video

Second edition,

the smoke is mostly from the back where the bridge wire is. It wasn't sealed permanently because I was testing different setup.

Update - Feb 11, 2012
Testing the piston with parachutes.