In general an axle is a centre shaft for a rotating wheel or gear. So In general axle shaft is on which the hub of the wheel is mounted. In a rear wheel drive, on side on the axle is attached to the differential assembly and the other side is attached to the hub.
The average cost of a vinyl replacement window is between $400-$575 per window for a double hung. That price includes the cost of the new vinyl replacement window and the installation of it. The big difference in price would be for reasons like the manufacturer of the vinyl window (which series you go with in their line), grids, low-e and argon gas for example. Vinyl casement pocket replacement window:
The average cost of a vinyl replacement window is between $400-$575 per window for a double hung. That price includes the cost of the new vinyl replacement window and the installation of it. hopper window would replace an old steel framed single pane window. Depending on the situation, the steel frame could stay in place and act as a stop or something for the new window to butt up against. The average cost of a vinyl hopper replacement window is between $300-$400 per window.