How do you make a folding knife auto open?

Answer 1

Folding knives do not auto open, a folding knife would refer to a knife such as a buck knife, or swiss army knife, both of which require to be manually opened. If you are asking how to convert a folding knife or "folder" into an automatic knife, well it is possible but it would have to be enabled for conversion. For instance, a boker magnum AK74 knife may be sold without a spring for legal reasons, then to make it the automatic switchblade it was meant to be, you would have to add a spring by taking it apart. If you are asking how to open an automatic knife (i.e., a switchbalde, or spring assisted knife), then the answer is it has to be engaged with the push of a button, a switch, or a lever; doing so will allow the spring to deploy automatically given you took the safety off if it has one.