Hello, in my next project I would like to have buttons pressed with a front mounted pcb. I mean, one way to do it is drill a hole and make the button go through the pcb. but the way i'm after could be to have a slot milled in the top board to make a "pad" that slightly flexes and in turn presses the button below it. obviously for this to work the board should be slim (i'm thinking around .6mm thickness would do) but the actual question would be how small can I draw the milled slot to form the "pad", since smaller the shank used to mill, the better the result :) in this image you can see what my question is about:  Here you can see I have drawed a slot to make the button pads with 1mm shank in mind, but I am wondering if you support such a small milling, or even if you can do smaller. If you don't support sub 1mm (or even 1mm) milling, what would be the smallest diameter that I could use in the design for the milled slot? Thank you so much in advance for your help!