^^^ Yup, if the bolt hole has that many threads left, I'd use a longer bolt. That's the least invasive way.

__________________
Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport