This article was published in the December 2010 issue of "Amateur Radio" magazine. Download the details here.
The article text (Word 2000 format)
A home made flycutter (JPEG)
Sheet metal drills which you can buy. Ordinary twist drills can be ground to this form :-) (JPEG)
Circular saw blade details for aluminium cutting (JPEG)
Jobbers reamers for enlarging holes (JPEG)
A pin chuck and a hand operated sheet metal nibbler (JPEG)