What you will need:
A Rotary tool ( Dremel )
A Pack of Cut-off Disks
A key Blank (..Of your choice )
A cold drink

First step, ( whatever that's in red, means it needs to be cut )
Take your original key, and mark where the cuts are like in this picture.

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Next,
Cut a " line " of about 1-2mm thick down where the marks of the cuts from the original key are like so,

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This is what it would be supposed to look like after the cuts are made,

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Now,
Cut a straight line thru all the peaks, try to make the line in the middle of the peaks like this,

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This is what it is going to look like after the cuts are made,

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Next,
Cut diagonal lines on the peaks like so..

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Do this on the other side of the peak also..

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This is what it should look like after the cuts have been made to the peaks, the bumpkey is almost finished.

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Now you wanna be carful here. You need to remove a little bit of metal on the head, and a little bit of metal on the shoulder. I find that taking off 5mm on the shoulder works, and 0.2-0.3mm on the head works ok, but this could work better your own way, this is just my way


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Here's the final result on the key..

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So I hope this will help all the people that are willing to make some bumpkeys, and think they can't. Well here's another great method for making some, and it works !
Also if there's somethings that could make this tut better, simply tell me and i'll edit it with pleasure.
Cheers
