No inside access, no problem! A single Q10-32 Well Nut made of rubber with a brass nut-sert. Must use with 10-32 machine screws. Can be used with brass and stainless steel. Well-nuts are 5/8 in. long by 3/8 in. diameter. Confluence Part Number 9800262.
See Specs For Well-nuts and stainless steel screw 10-32 x 1 inch
See The Related Article: Basics of Strap Eyes, Rivets and Well Nuts.