For some reason hex bolts don't work well for HIC. But allen-head bolts do, so if it's a hex bolt (6 sided) ditch it
Locktite the bolt threads, make sure you use blue locktite, red is permanent.
not really permanent man..
Loctite® Threadlocker Red 271™ is designed for the permanent locking and sealing of threaded fasteners. The product cures when confined in the absence of air between close fitting metal surfaces. It protects threads from rust and corrosion and prevents loosening from shock and vibration. It is only removable once cured by heating up parts to 500°F (260°C).
http://www.loctiteproducts.com/p/t_lkr_red/overview/Loctite-Threadlocker-Red-271.htm
source
Oh, I'm sorry. Yeah, heat your forks up to 500 degrees Fahrenheit.
Hurrrr.