Pls help, rounded bolt - see pic

[janesssssy]

Photo is of my bike frame. 1 of the 2 black bolts have rounded so I can not remove the black shock mount. I will need to remove soon as will get this sprayed professionaly.

Any ideas?

 

[janesssssy]

photo is small, cut out of the orginal photo. But dremel would be the way to go.