Cody - I have not done it but I imagine it you forges a longish U or V shape from spring steel and added a little clip either forged or just welded to hold it in place it sould work?? Just heat to critical and quench. As long as you make it so that there is limited movement(you only need a coule inch gap) I cannot imagine it would crack in use. Take this from someone who has not done it but I certainly would try bacause you have nothing to loose. If it does fail you can use the steel for knives later.
all that said, if you can make it work w/o a spring then less is best :-)
Bob Urban