keep a certain distance between two links after attach active

[sligeek100]

Hello friend,
-- tried this pkg, there is one situation, if before I attach these three cubes, I manually move one to a position, then I attach them, the problem is it will just keep the relative pose after I moved one cube, is there a way I can set the link's relative pose when attach them ? Please let me know ur advics

thanks in advance
Leo