Found them at Hobby Lobby. 1/8 inch I.D. Dura-Collars, set of four.
They are part number DUB-139. When I run a search for that number, the wrong size & p/n appears.
I guess they have their database skewed. If I search for "set screw collars" the right ones appear. Go figure.
http://search2.hobby...t+screw+collars
Figure around seven bucks with shipping. Any local hobby shop that sells DIY radio control supplies carries these.
I didnt feel like wasting time and gas driving around looking for them. The interwebz is more convenient.
McMaster Carr carries them too, not sure if they are available with the plated finish and could be prone to rust.