the servo saver is missing a screw, the thing that says servo on it is servo, id pull saver off then see if servo move and replace missing screw in hole in servo saver thats the black thing on servo with steering rod attached es then you will know if rx is bad thats a old 27 mhz radio might have issue and a ton of other interference ..The issue is the missing screw in the servo saver I can see the hole that the screw goes in. replace missing screw sorry can tell you screw size the manual should tell you size..