On the crankcase, in the middle of the air box, just beside the crank cover is a bolt hole (at least mine has) Does the hole in your cover fit over it? If not you could make a bracket between the two and bolt them together.
The slot beside the cover hole looks like an incredibly small access point for tightening by Allen key. Obviously designed by Bastards Incorporated, a company, luckily, not widely known outside Australia.