Read drill tolerance and DEFAULT_INTERNAL pad(s) from padstack

I'm trying to get both the associated hole tolerance from a padstack definition and the defined "DEFAULT INTERNAL" pad(s) using the Allegro SKILL api.

I am able to extract all other portions of the padstack definition except for these two pieces of information. I have tried iterating over the "pads" property of the padstack but the "DEFAULT INTERNAL" pads are mysteriously absent. Similarly, axlDBGetPad is not able to retrieve the pads (as far as I can tell). There are definitely default internal pads defined for the padstacks.

For the drill tolerance I can't seem to find anything about how to retrieve the tolerance values in the documentation. All other drill properties (drillOffset, drillDiameter, etc.) are associated with the padstack definition object and are perfectly readable, but the hole tolerance is mysteriously missing.

I've scoured the Allegro SKILL documentation but can't seem to find any information on these issues. 

Any help or advice would be appreciated. Thank you. 

I'm using Allegro 16.3