Tip on this unit is long triangle shape in the case. Could be possible that it broke but i don't think so think it might just be wore down. 710 ia an old unit an has been out for few years, so it seems likely that with the use you put it through it probably wore out. You can take the unit apart and check if you want depending on how comfortable you are with this type of work. If you need help or directions with how to take it apart let me know and i will post some instructions for you on how to do it.
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