T-Seal
  
Set
Up:
-        
2 mm Pyrex rod
-        
8 mm Pyrex tubing
-        
# 1 tip
-        
Matches/mats/towel/glass cutter/screen
-        
Blow tube/cork
T-
Seal (8 mm tubing):
-        
Cut 2 pieces of 8 mm tubing (8" and 6" piece).
-        
Use a # 1 tip.
-         Cork one end, of each piece of tubing. 
-        
Heat the middle of the 8" piece of tubing and blow a small bulge.
-        
Flint knap the rough pieces, leaving a small part of the small bulge.
-        
Heat the end of the small, 8 mm tubing and the hole in the other tubing,
remove from heat, push them together then slightly pull them apart.
-        
Heat one side and allow to collapse
-        
Remove from heat and blow to diameter of surrounding tubing.
-        
Slowly, repeat for the other three sides.
Patching
holes (2 mm rod):
-        
Use a #1 tip.
-        
Heat the area with the hole and the 2 mm rod.
-        
Touch the rod to the hole, remove from the flame, and pull off the rod.
-        
Heat the area with the hole, remove from the flame, and blow the tubing
to the surrounding diameter.
-        
Remove any excess glass with a cold piece of glass.
-        
Continue heating and blowing until the tubing is uniform.
           If you had taken my "Scientific Glass Blowing Class", up until now, everyone has a "F".  Once you've completed, todays lesson sucessfuly, you now have a "D".