the first pivoting boom adjustable foot stop 1042 and second pivoting boom adjustable foot stop 1044 come in contact with a top surface of electronic control box 120 thereby creating a restraining force on the electronic control box 120 which helps to reduce movement of the electronic control box 120 relative to the boom connecting rod 1040 electronic control box 120 is shown coupled to pivoting control box support 1041 by first boom side upper connection loop 1080 and first boom side lower connection loop 1070 as well as the combination of second boom side upper connection loop 1082 and second boom side lower connection loop 1072 now referring to fig8 there is shown the mobile rock crusher 100 including pivoting boom structure 101 as well as boom pivoting control and power system 800 which may include a boom power source 802 and boom control station 804 with a boom control lever 806 and boom control up and down buttons 808 however a preferred embodiment may have either one of the boom control lever 806 or boom control up and down buttons 808 it should be understood that other types of well known controls for controlling hydraulic pneumatic and electric or mechanical actuators could be used hydraulic locking valves could be used as well to secure the electronic control box 120 in place with the first pivoting boom adjustable foot stop 1042 and the second pivoting boom adjustable foot stop 1044 when being stored for transport the term u201c rock crusher u201d is used throughout this description and is intended to be construed in the claims as a mechanism for crushing hard objects such as rock concrete or other aggregate type materials the term u201c vibration transmissibility u201d is intended to suggest the ability of something to transmit vibrations from.