Building a better Guinea and Feather

Step 8 Bottom cap block and object platforms

The Bottom cap block is also similar to the Top cap block except for two 1/4"-20 bottom-tapped holes to mount the object landing platforms. The objects in the two vacuum tubes will land on these platforms, just above the top face of the Bottom O-ring block. Without the platforms, the objects would land out of sight below the right angle brass fittings. The platform outside diameters are smaller than the 2.25" tube inside diameter and they are drilled through the top and sides to allow air to be pumped out of the tubes.