MiddleC

That was it! Thanks, and the other answers were right, too.

Interesting. I thought about struts, but assumed it would make a mess when they were still attached on decouple. Will do. Funny, I learned about KSP from XKCD, where he joked about "more struts".

I have a straight-up liquid fuel rocket. I want to attach big long solid boosters () to the side, staged with radial decouplers (trying TT-70 decoupler). I have only been able to attach a booster to a decoupler at the booster's midpoint. The long boosters then flop around in flight. I want to have decouplers at the top and bottom of the booster, but I can't get the UI to do that. My experience of the UI is, while moving the booster, if I point the mouse right at the decoupler, it attaches the booster midpoint, no matter where I "grabbed" the booster. If I do not point at the decoupler, the booster gets attached to the hull, instead. If I have two, vertically aligned decouplers, the booster only gets attached to the one I point at. All of that makes some sense, but I just can't figure out how to do a 2-point, decoupling attachment. P.S. I am able to ride this garbage into orbit, with the thrust vector moving all over as the boosters flop about. (Sometimes.) I'm bad.