It'll take us a while longer to 'iron out' the wrinkles/kinks in the network. [=to fix the small problems in the network]
Although he won't say exactly what he's working on now, he says he has quite a few 'irons in the fire'.
You had better have a 'cast-iron' [=('US') 'airtight'] excuse for missing the meeting.
(..) Dentists... tell you not to pick your teeth with any sharp metal object. Then you sit in their chair, and the first thing they grab is an iron hook. And they start to pick in an area that you came to get fixed. l found out something about myself while the dentist was doing that. (..)1983 Bill Cosby: Himself