This is the Number 2/closed position. The gas tube has a detent for this position.
Started the notch with the sharp edge of a triangular file, then finished with a round file.
New notch at 11 oclock.
Sleeve installed, and rotated to the new Number 1 position. The new holes will be drilled inline
with the other vent holes and 0.45 inch from the squared edge of the gas tube.
Tried center punching the gas tube with only one layer of tape. Ended up sliding off the
gas tube sleeve, scratching it. Put 6 layers of tape on the tube and it was enough to
prevent sliding off. The proper size drill bit for the hole through the gas tube is 1mm.
Could not find one locally, so, went with a #60 bit. They are very close in size.
The #60 went through the outer sleeve, but would not go through the gas tubes hard chrome surface.
Ordered a good quality 1mm bit. It went through the gastube with ease.
Right side vent.
Left side vent.
The gas tube sleeve was removed and the 1mm holes were enlarged with a 5/32 bit.
Note the marks on the gas tube where the #60 bits broke while trying to drill.
Other side. Thats better.