add_back_drill_stub_length# Rules.add_back_drill_stub_length(name: str, value: str) → Rules# Append a maximum back-drill stub length rule. Parameters: namestrRule identifier for reporting. valuestrMaximum allowed stub length with unit (e.g., "6mil"). Returns: RulesSelf for method chaining. Examples >>> rules = Rules().add_back_drill_stub_length("max_stub", "6mil") >>> rules.back_drill_stub_length[0].value '6mil'