Used to might.

source: 
LAGS
Entry: 
695
Example: 
Used to might.
Modal 1: 
used to
Modal 2: 
might
Gender: 
Male
Race/Ethnicity: 
White
Age: 
77
Level of Education: 
11th grade
Home Community, Town, or State: 
AL (New Brockton)
Location Collected: 
AL (New Brockton)
Year: 
1976
Relation to Addressee: 
subject to fieldworker
Medium: 
Spoken
Sentence Structure: 
unknown
Status: 
Naturalistic