Hi Per,

I'll take your word for this. All I know is what the data sheet says. The sum total of my chemistry education were two required undergraduate courses. Did I mention they were "required." In particular, I could never get a handle of the naming conventions; when's it an -ide or an -ate or an -ine? I think it was Enrico Fermi who said, about high energy physics if memory serves, that if he wanted to memorize all those names he'd have become a botanist. That's how I feel about chemistry.

I know what you mean about breaking them. Many years ago, before I got my C60, I used a Dremel tool in a drill press stand to drill my circuit boards. Try as I might to make certain that I didn't move the board before I had fully retracted the bit, I still couldn't keep one long enough to wear it out. Since I got my C60 I've broken precisely one bit. That one I broke because I figured there was no harm in using an underlayment board twice. Like I warned Mahmood about, the bit intersected one of those preexisting holes and it was over before I knew it had happened.

Joe