An ignoramous asks: as someone who's never ridden a Commando with a DT-type head steady, and isn't in a position to experiment by just buying/making one and trying … I'd be grateful for an explanation of how it is 'better' than the 'Norvil' style. I remember following Mike Taglieri's experiments donkey's years ago, so maybe I've just forgotten this detail, but … Trouble is, I understand the purpose of the Isolastics to be to stop any appreciable 'sideways' movement by the engine, limiting movement to a vertical plane in line with the length of the bike. And, when I look at the DT head steady, it seems to encourage sideways movement, since the rose joints form a bar that pivots around its attachments at each end: to my understanding, this means that the engine-end of that bar must 'swing' around the head-steady end, since that end is fixed in relation to the frame. So, laterally, the bar 'becomes' shorter and longer as the engine bobs up, down, backwards and forwards. Is that right, and is it simply that the effect is negligible, or what? TIA