How to create a smoothie making human powered bike blender for less than $25

Step 4 Make inner wooden supports

Using the hole saw, cut 3-2 1/4 inch rings out of the 1x8 board. Glue them together in a stack using wood glue, clamp, and allow to dry.

Once dry, use the saw and file to cut 2 notches on opposite sides of the cylinder. These notches will allow the cylinder to fit between the two columns in he base for the original screws.