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 cost to install a window can vary dramatically depending on the brand, materials and local labor costs. Replacing a standard-sized window will cost, on average, $200 to $400 installed. A standard sized bay window costs around $2,000 to $4,000 installed. A basement window costs approximately $100 to $500 installed. A garden window costs an average of $1,000 to $2,000 and some garden windows could cost up to $4,000. Storm windows are mounted on a window, either externally or internally. They are used in cold weather climates to improve a window's energy efficiency.