first of all, if you do not have the overload mod, you may want to install it because this is easier with overload

so, after you have installed overload, let's get to electromagnetic suspension

I figured this out while I was making my PX1 project FW.

grab a piston, click on the XML button and look for the scale part. then put in 1,0.01,1. then click the top and click on piston and then make it so that Range is 50 or so and set push to false or pull to true. (whichever is there, cause I don't know) and then if you want it to stay extended, go to InputController and set the activationgroup to 10

or if you don't want to do that here is one already set.