Blow up a 260 about an inch and a half. Tie
nozzle then also tie a knot in the far end of the balloon
Tie a loose know in the middle of the balloon
Hold the balloon about 1 cm from far end and stretch tip.Hold left
hand over uninflate balloon and squeeze the bubble with right hand.
You should have a bubble at each end.Holding a bubble in each hand
squeeze air from one side to the other until the bubbles equal in
size.
As soon as they are the same size pull bubbles apart sharply. this
tightens the knot and means the air can no longer travel from one
end to the other
Once that is done you can make a tulip twist at each end by pushing
the knot into the balloons then grabbing and twisting