The SewEzi Quick Change Set is a clever system to cope with the variation in heights between different sewing machines. Each set consists of sixteen (4 x 4) 1/8” (3 mm) plastic shims. They click together like Lego blocks to make stacks of different heights depending on the difference in the height between your machines. The base shim of each set has a pin sticking out which goes in one of the holes in the platform that the sewing machine sits on. This stops the Quick Change Sets from sliding around. Place one stack under each foot of your sewing machine. You will know if you have the right number of shims when the free arm is level with the acrylic table insert.
There is a pocket in the SewEzi Portable cover to store the Quick Change Sets.