Prototype 44

Practical

Addaption of Prototype 43
Focus: preventing the tube from being deformed when wheel collar is tightened
Duration: 15 min
Materials: aluminium tube + prototype 43
Principle: putting a smaller tube inside the big tube for strenght
Prototype:

Photo's 

the wheel collar can't be tightened because the tube deforms

a little extra piece

put it upside down inside the bigger tube

now the wheel collar is tightened

Matrix

positive expected: wheel collar is tightened