Below is a picture of a head with detonation. Its difficult to see on the photo but some material is actually missing. Its been corroded away by the explosions. In the marked area there is a groove as if it was etched out by acid.
![](https://lh4.googleusercontent.com/-jg2_Gp9JLgI/UG65nRBEmFI/AAAAAAAACjI/gQkj6FN3U3A/s1024/IMG_6986a.jpg)
_________________
Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom