First take a wooden cube of 25 mm at 25 with a minimum height of 20 mm.
Now drill with a drill bit a hole in the wooden piece for the hose from the dremel. The diameter must be 11 mm. Drill then on 1 side of the cube a hole for the nut and the bolt with diameter 6 mm. Do it booth in the middle of the block. You need to place the nut in the hole with some glue. (4)
If this cube is ready, you need to place the hole of 11 mm concentric with the hole on the upper plate.