Assuming you haven't tried to drill the bolt yet, you could try a suitable size Torx bit, as pictured:
Tap it into the deformed Allen recess, then use a spanner or socket to undo the bolt.
Assuming you haven't tried to drill the bolt yet, you could try a suitable size Torx bit, as pictured:
Tap it into the deformed Allen recess, then use a spanner or socket to undo the bolt.
Location: Surrey, UK
Posts: 506
I'm Mark.
You probably can't do this if access is limited but filing some flats on the round head might work another time - don't think anyone has already suggested...
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Location: Ontario, Canada
Posts: 791
I'm Svend.
One bottle should last decades, as you only use a drop at a time. Of course, it probably won't work if the screw head is totally rounded off...there should still be something for the wrench or driver to grip onto. But I use it as soon as a screw head starts rounding off to avoid further damage. Together with penetrating oil on the threads, you should be able to get most stuck screws and bolts out.
Let me know if you try it.