Well I've never done this myself but I have taken a few autos apart.
I don't know what the colt looks like if it's a button lock then it will be pretty straightforward..you basically need to drill out a space in the bolster to take a coil spring, then you need to drill a hole in the blade to take the end of the coil spring ( you will need a tungsten carbide drill tip for this, and probably a drill press)....if you go to here
http://videoknife.com/
and look at how to change a coil spring.....one of the clips, then you will have some idea about how they go together , and then realise what you need to do.....you can buy all the necessary parts here
http://www.knifekits.com/kk_1mainfra...lcome.htm~main
if on the other hand you want a leaf spring knife like this
http://www.youtube.com/watch?v=CTY_tTLrm1k then you can still buy the stuff at knife kits and some instructions how to turn one of their knives into a dual action auto.
Hope that helps some
also FYI.......Mikovs are sold without the springs and you can fit them yourself, you cannot tell a dual action knife apart from an ordinary folder.........I hope that is some good information for you