Drawing is the easy part, coming up with a practical working design to draw is the trick. As I said before, Marlin used a spring steel extractor is their 22\'s, a pic is here on the forum. Rather than reinvent the wheel, I bought a marlin one for $10 and can assure you its only about a half inch long, .025 thick, about .075 wide and has very high tension. I suspect it is made of 1095 alloy as are most firearm flat springs. It was pretty easy to investigate the requirements for a flat spring steel .22 extractor. I concluded that it might be possible to use a flat spring on the DE bolt but a conventional spring loaded finger is the method of choice by myself and nearly every gun manufacturer. Soon I will see if its practical on the DE gun. There is not a lot of real estate to work with.
I am at the point that the bolts are next to complete, everything else is about done, so I have to make a decision soon.