After hearing about bump keys and watching several videos on youtube, I decided to have a go at making my own using a key copy and a file.
Well, it opens my 5 pin Yale cylinder when I use the bump technique, but the lock also opens if I sort off wiggle the key in the cylinder.
I took a picture of my key (I like my photographer work) and I wanted to see what I was doing wrong, I made an Abus bump key but it only works in the original cylinder and not any other Abus cylinders which are the EXACT same.

I read up somewhere that to bump a 5 pin cylinder you only need four cuts..
Please can you spare some advice, thank you.[/img]