@raprap,
Switchblades are now legal in Pennsylvania, but these are now called "Spring assisted folding knives"
Pa requires that , for these knives to be legal, the spring must connect the blade directly,(There can be no "button" that dispatches the spring that opens the blade. The "Button" is now part of the blade.
I have a SOG knife I use in the foeld an its a spring assisted and it frees your hands up if youre holding something else. So, in Pa, we have legal switchblades and stilletos, so long as the blade /button rule is obeyed
The SOG knife has a blade that is non wobbly (like the way most of the old "Italian" switchblades used to be)