You are reading a single comment by @Harry and its replies.
Click here to read the full conversation.
-
Rivnut doubly-secured with epoxy is how I've replaced bottle cage mounts in the past.
Got some spare alu M5 rivnuts I'd be happy to pop in the post.
@pastry_botEdit - just realised it's a steel frame so an alu rivnut may corrode
Harry 
A steel rivnut, splined for preference, and a blob of epoxy should be fine. If you want a suitable rivnut, let me know. I have many.