Hmm, my car will produce just about 1.1G on a good start. It won't do that for long - maybe for half a second or so, but that's equivelent to holding the empeg facing directly downwards in its sled and jiggling it about a bit. I tried that before installing the Empeg, and predictably enough it fell out so I was half-expecting problems!

I'm fairly handy with a dremel, so will have a look at making more positive hooks. Well, modifying the existing hooks at least.

I quite like the rubber sheet idea too, although it would have to be quite a thin sheet to fit. The sled is well made and a nice accurate fit against the Empeg itself. I reckon it wouldn't need much area to increase the friction by quite a lot, given the closeness of fit already. Perhaps a pair of thin strips on the sled running from the front to the back, so they have more resistance to peeling while the unit is being removed/refitted.