Alright, working with parts with multiple modules is rather confusing or possibly incomplete. The page 1 instructions give three-ish methods for modifying multi-module parts, neither of which seem to be working. @PART[B9_Cockpit_MK2_Nosecone_ASAS]:Final { @description = LOLOLOLOLOLOLOL @mass = 0.4 @MODULE,0[ModuleScienceExperiment] // Seismic { @experimentActionName = SEISMIC } @MODULE,1[ModuleScienceExperiment] // Barometer { @experimentActionName = BAROMETRIC } @MODULE,2[ModuleScienceExperiment] // Gravity { @experimentActionName = GRAVITATION } @MODULE,3[ModuleScienceExperiment] // Temperature { @experimentActionName = THERMICS } } result: names of experiment actions are not changed (I just did this name change as a simple test to see if i could get the indexing working properly). but the earlier @description and @mass changes DO take effect @PART[B9_Cockpit_MK2_Nosecone_ASAS]:Final { @description = LOLOLOLOLOLOLOL @mass = 0.4 @MODULE[ModuleScienceExperiment,0] // Seismic { @experimentActionName = SEISMIC } @MODULE[ModuleScienceExperiment,1] // Barometer { @experimentActionName = BAROMETRIC } @MODULE[ModuleScienceExperiment,2] // Gravity { @experimentActionName = GRAVITATION } @MODULE[ModuleScienceExperiment,3] // Temperature { @experimentActionName = THERMICS } } Result: same as above, mass and description changes properly, experimentActionName remains the same This sounds like it is designed to work only if there is a "tag = foo" declared within the node. These parts are from another author's stuff, and they haven't included "tag = foo" on any parts. I was thinking I could just use MM to add the "tag" flag, but to do that, I somehow need to be able to modify individual subnodes again, which I obviously can't get working. Haaaaalp! Also, major awesome thanks for ModuleManager in the first place. Fantastic original work, fantastic extension to it, and I love what it lets us tweakery folks do!