Aerodynamic Balance Design is one of the most precise and difficult types of multidisciplinary design to accomplish. Raise that to supersonic flows of up to Mach 6 with initial vacuum atmospheric pressure and things become exponentially complicated. 

This is the reason for the specialized select companies that charge upwards of US$60.000 for each one. With requirements in expertise in structural mechanics, dynamics, fluid mechanics, electronics and precision fabrication, the price is well worth it. 

Engineering however is the art of reducing costs, while increasing precision. 5 Generations of experimental balances, lead to a balance that could be replicated within less than 2 weeks with a total cost of less than US500.00.