- Joined
- Feb 22, 2010
- Messages
- 5,622
- Location
- Stirling, Scotland
- Car
- E55 AMG W211, E250 Sport W212, (and some Imps)
I tried to undo that countersunk screw with some imperial hex key which seemed a good fit and after trying with quite a force it is no longer a good fit... T30 bit does not go in, T25 is too small, 4.5mm hex too big, 4mm hex too small. So removing that countersunk screw will be quite a challenge. I was hoping that perhaps that "magic" torsion spray will help - but the above suggests it will not.
I have no idea why you have decided to use "some imperial hex key".
Pretty sure from memory the bolt is a Torx 30, a good clean, spray of release fluid and a good tool are your friends.
Using the wrong tool will only make the job harder.
If you have rounded it now I would simply drill it out and get a new bolt.