I've added some bronze self-lubricating bearings to the bucket linkage. I don't think they were really required, and it goes against one of the goals of this project, to keep it simple, but it just pains me to know that there is a load-bearing joint without any form of bearing in it. So it had to be done! :-)
The parts:
 - Clips: 
HSP 02053 Body Clip
 - Bearings: 
8 x 10 x 12 oilless bronze bearing