Shaft center line heights between the driver and driven equipment are usually different. How does the engineer address this height difference? Usually, different height pedestals are affixed to the skid to accommodate these differences. This solution is costly as additional craftsmanship is essential to fit-up the steel work and welding required while holding the co-planer requirements for mounting surfaces. Meeting the flatness requirements is tough in the shop. But the unit still needs to be transported to the site and installed. Making the mounting areas coplanar and flat again can be costly.