Design of the key in respects to bump keys.

[qwerty125]

I've been reading some threads here about bump keys and watched bumping keys revisited and had a question as to the design of the key itself. I usually see keys that are clearly defined so you know where the pins rest but then there are others where the top is flat and several pins may land on it.. then how do i know where to file down?

Like here is a picture of a key template that i found somewhere in this forum...

In situations like this, where would you file down for point B & D on the second picture.. I figure the rest of the points should be filed down further since the points are too high?

[qwerty125]

I couldn't find an edit button so I wanted to add that what I meant to say about the picture was.. I found the top portion key template and just modified the key were I to file it down.. so I made those points and had a question about it after looking as all the keys i have at home (i have a box of keys we have from the various locks that we put in storage)

[vector40]

That second key's like nothing I've ever seen in an ordinary pin tumbler.

[treboR]

Some pins have flattened bottoms. That is why you see flat spots on the key. You just file them down and keep their shape about the same.

[qwerty125]

Ah ic.. so when making bump keys.. IF theres a flat surface you don't file a crevice into it.. you just file it down and keep the shape?

[treboR]

Ah ic.. so when making bump keys.. IF theres a flat surface you don't file a crevice into it.. you just file it down and keep the shape?

If you can. My file is not small enough to.