Another trick is to put the whole tube into hot water to soften the filament but not the bowdentube. It is a bit more controllable than hot air.
Neotko's method is a little quicker if you've done it 5 times but also more dangerous - you could just melt it in there. Pouring a pot of boiling water into a pyrex or metal pan is the perfect temperature for this: 70-80C (even though boiling water is 100C it will cool very quickly when it hits the pan).
It helps to have gloves or tongs. And a friend (4 hands).
Use a hairdryer to heat the bowden push another peace of filament so they bond, then when they fuse a bit start pulling. That should make the 'big' part smaller.
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