My nitro HPI rs4 mk has two problems #1 the ripcord starter has no spring so it doesn't come back in when you pull it out. Is there a way to deal with this or does anyone know where I could find one? Question two the steering servo barely moves so I don't get much steering is there a way to fix this or do I just need to put in a new servo. Also not really a question but my throttle servo twitches and is unpredictable from up close that is normal right?