Removing Soldermask from Backdrill Vias

Question

I'm trying to remove the Soldermask_Bottom from my back drilled vias that are on my design. Right now, I'm attempting to do:
Select via > modify design padstack > single instance. Once in the padstack editor, I'm changing the backdrill_soldermask to "None":

After saving I get some warnings and upon exiting, nothing is changed. The last warning is: "Default backdrill data from design will not be saved in pad file" 
 Is there a different way to tent these vias on the back side?

avant · Accepted Answer

Open, modify, and save the pad stack under a new name. 
 Replace affected pad stacks (single instance, one at a time) with the new pad stack. 
 If this is too time consuming, ask someone here to create a script to do it automatically.

CP202407234840 · Answer

This is what I ended up doing. Thanks!

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Removing Soldermask from Backdrill Vias

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