How to remove rubber feet from CAL Alpha?

I tried removing stock rubber feet from CAL Alpha to replace them with cones but couldn't do it.The philips screw makes 2 turns and seems to tighten up again.This happens on all 4 feet.I opened the unit but the bottom is obscured by electronics.What should i do?Thank you for your responses.
Leave them on and place the cones as close as you can to the corners. You could try placing the cones pointed up. Or, carefully disassemble the player to get at the feet from the inside.