• 1

    Take a standard male 4mm bullet connector, you'll see it's a sloppy loose fit in a 4mm banana female connector. 

  • 2

    Take a scalpel or craft knife and run it along the 'split' in the metal where it's folded round, and open it up about 1mm. It will then be a tight fit.

  • 3
    Save like scrooge mc duck!

    As bullet connectors are about $0.04 each (or less) it's a significant saving over buying standard banana connectors, or for use in an emergency if you've run out.