The design of the HAM-SAS counter weight bells for the IP legs, as shown in figure 4.1, is tested in the AEI-SAS. In HAM-SAS, the bells were designed but never tested due to lack of time. The IP bells were too heavy and will be re-machined to reduce their weight and tested again in the third AEI-SAS. See chapter 4.3 for more information about the IP.