I went to the bike shop today, checked out the CO2 bike pumps and at �ã4 for two 16g threaded capsules they are still in the shop!
I came back and had a really good look at the 16g capsule and the 8g capsules that I had and decided that I could do a safe and easy modification to the existing system to use 8g capsules so I:
1. Compared the business ends of the two capsules and discovered that although the shoulders are different the actual penetration bit is the same size on both capsule.
2. Measured the overall length of a brand new 16g capsule and it came to 88mm.
3. Sawed the end off a used 16g capsule and checked that the 8g capsule would go inside it.
It did.
4. Built up the bottom of the 16g capsule with kitchen foil so that the length of the two capsules came to +/-80mm.
5. Mixed up some "plastic putty", put it into the 16g capsule, spat on the 8g capsule (the spit stops the plastic putty from sticking), inserted the 8g capsule into the 16g capsule and compressed the two together in a vice until I reached an overall measurement of 88mm;
making sure that the 8g capsule was centred within the 16g capsule.
6. Spun the 8g capsule around to release it, checked the smoothness of the putty (it was a bit rough), spat into the capsule again and "fine tuned" the length and smoothness by turning the 8g capsule around before removing it.
7. After letting the putty set (about 15 minutes) I dried the two capsules out with a tissue, placed an "O" ring over the 8g capsule and fitted them together. (The "O" ring centralises the 8g capsule within the 16g capsule.)
8. I then fitted the modified capsule to the Flexi-Tap
and IT WORKED!
The one safety proviso is that there is
ALWAYS the chance that liquid CO2 will spill out of a capsule when the end is being pierced. To prevent "cold burns" I
always wrap the capsule and the piercing device in a thick towel when connecting a new CO2 capsule.
Here's a couple of photographs of what I did.