Rounded bolt ?

The usual method of removing a bolt where its head has been rounded off is to hammer on a smaller good quality 12 point socket. Then use a socket wrench to wind it out.

As David has recommended, soak it in penetrating oil or Plus Gas for a few days first.

You may need the "EasyOut" tool if the head shears off, or, alternatively drill the bolt out with a drill bit of a smaller diameter than the minor diameter of the bolt. Re-tap the female thread afterwards so that a new replacement bolt will fit nicely. Use copper grease when re-assembling.

ChicksFan
October 2011

Not familiar with the item, but you could soak it with penetrating oil, such as WD40 over several days,& then, if it is accessible drill it & use an "easyout" to remove the offending item. Hope this helps ! (easyout is an extraction tool with a tapered left hand thread designed for this purpose)

davidj
October 2011