To answer your first question, yes it's possible that the ways of input are switched between imperial and metric units. However this wont be a problem if you unswitch them by using key appropriate.
If components must be mounted on the PCB with screws, then use pads. Pads have holes, screws require holes, therefore screws may require pads. Pads are the best option to use, they can have zero annular ring, be marked as unplated and untented. If you only need holes then just set the pad size to 0. Have the hole size as necessary. And finally... dear god, ring up your Protel/Altium reseller and ask for a tutorial on using the package. I really have never met an engineer of any kind that appears as incompetent as you... and that includes civil engineers :P Bevan > Hello, > > Is it possible that the ways of input are switched between imperial and > metric units? > There are some components such as switches and potentiometers which must be > mounted on the PCB board with screws, not with pads. Do I need to place vias > for the mounting? As far as I know, vias connect layers electrically. But I > need only holes in this case, is it a problem? > > Best wishes,
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