I'm planning on hanging a chair from the ceiling. From what I can tell the best method is to add a crosspiece above multiple joists, and mount the chair to that using an eye bolt.

![Diagram](https://i.stack.imgur.com/dVZOd.png)

The problem with that is that there is a reasonably large distance between the eye, and the crosspiece.

I can't find a suitable eyebolt (rated to carry a load) that is long enough to cover the space needed. The [longest I've found](http://www.ebay.co.uk/itm/M12-Long-Shank-Eye-Bolt-Harness-Point-B-S-Standard-400kg-SWL-DK26-/141412783366) is 225mm overall (so about 207mm ceiling to top of beam). I would need one at least 300mm long overall, 

Is this a suitable method, and do eye bolts of the required length exist that will carry the load?