Spring steel can usually (noticed I said USUALLY) be drilled by running the drill very slowly, using plenty of thread cutting oil and keeping a steady and relentless pressure against the drill bit. If the drill ever makes a turn without removing metal the steel will instantly case/work harden and all forward progress will cease. This same system works on stainless steels that work harden when drilling. Unka Jesse > I wonder what I said? > > Punching it, "burning" through using a car battery and electrode, and... I > am sure there are other ways but my mind has gone blank. > Alan MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.