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TL;DR: I've done something perverse and now I can't re-root the vehicle for attachment to a launcher in the VAB. I built a vehicle and, behold, I saw that it was beautiful! Well, grubby and sweaty with my labor, more aptly. I afraid I am going to have to rebuild it from scratch. It had an Okto and a Sr. Dock on one end and a claw at the other. One can control from the Klaw while using it, but I particularly also wanted to relocate the root Okto away fro the Sr Dock (as it was impeding docking). In method 1, I added a new Okto and removed the first. Worked fine until I tried to attach my vehicle to a launcher in the VAB (via Merge). In method 2, I used gizmos to simply turn the whole body of the craft (except the Okto) around and then shifted it into place so that the Okto appeared at the desired end. Same problem in the VAB. I tried using a Subassembly instead. No go. Obviously a job for the Node Reroot tool! Problem is that when I select the pair of nodes (Senior Dock followed by the Okto), to reroot, the Okto gets itself the red outline that indicates it is no longer part of the ship. Actually, I notice this is present as soon as I import it to the VAB with Merge. (Thus, the fight is probably not with the evil Reroot Node tool, but with one of its minions.) I guess I will have to rebuild the vehicle from scratch; not so many parts; good practice: but I'd really like to know how to defeat (or avoid) the Reroot Node tool, next time we battle. The craft file is Gimlet