Butler & Davis, late 1700's

I am interested in learning more about the Butlers and Davises in Loughrea c. 1750-1790. Specifically, I'm trying to identify the siblings of Belinda Davis (1758-1832), who was possibly a daughter of John Davis (trustee of her marriage settlement). I'm also trying to idientify any siblings of Pierse Butler, a surgeon in Loughrea in the late 1700s; any siblings of James Butler (born 1780 in Loughrea, son of Patrick Butler of Loughrea), and any siblings of Thomas Butler (born 1764 in Loughrea, son of Cptn. Edmond Butler). I have already checked RootsIreland, The Testamentary Records of the Butler Family, and other materials. I found a pedigree of a Pierse Butler in the National Library of Ireland, but it is so fragile that obtaining a scan is cost prohibilitive. If anyone is aware of local resources about the Butler or Davis families in Loughrea prior to 1800, I would appreciate hearing from you.