My friends old trashed hpi rs4 MT has a cracked bit in the steering preventing it from steering very well. Gorilla glue and tape don’t work well. so I want to plastic weld it so me and him can go to the park nearby and have fun and so I can get his car and box of batteries and chargers out of my garage. I have seen plastic welding tips for soldering irons on amazon. Do I absolutely need one to plastic weld a small short crack? Or can I get by using the standard round tip that’s on it?