Bolt on my $380 office chair broke. Need suggestions.

[Duppers]

It popped and almost thew me back-wards! This was the second time this has happened to an office chairs of ours...and that's why we paid so much for this new one 4 or 5 years ago, thinking that a more expensive chair would last longer.

Any idea about repairing it? The bolt broke off in interior mechanism of the back of the chair. I'm afraid to even attempt drilling the remainder of it out but I don't know whom I could possibly take it to to get the thing fixed.

The chair is otherwise in great shape and is the only one I found that doesn't hurt my back.

Thanks!