Yep!! Only I envision the vertical post sitting back a little away from the road, with a horizontal pipe coming out to where the box is now. On this horizontal piece, fabricate a swinging vertical post, with the short end on top supporting the mailbox, and the long end hanging down with the counterweight..
If you wanted to be fancy, you could add a provision to pin it into place for summer use, when it didn't need to swing.
Last edited by sprkplug; 01/27/16 09:06 PM.