Something I have noticed is that a lot of people are having trouble when doing the duplication glitch, particularly when they call the insurance and they never answer. This is normally because you have positioned the journey right up against the garage door. Make sure you position it sideways and leave a little gap so when you enter the garage the door opens a tiny bit but then hits the journey and gets stuck. This is defiantly the best way of doing the duplication glitch to sell for full money!

Happy glitching!