Peter Nielsen
Viper Owner
They hand filed
No kidding... Here's how I would do it:
1) CNC mill (or manually operated mill)
2) Hand held router with guides
3) Dremel
Filing is something I did when I was a kid and could not afford proper tools...
I would go straight for #1 even though programming the mill will take some time... If your time is valuable, #2 or #3 are quicker choices...