Items identified.

I posted these items before but was unable to identify them. A friend of mine has done some research on them and come up with some answers. The bar was posted 4 months ago. It is from a mill and when rotated caused the hopper to vibrate to feed the grain into the grinding stones.
The 3 rings with protruding spikes caused a lively debate when I posted them 3 months ago. fhrjr2 came nearest to finding a solution with the suggestion they were used to bind wagon hubs.
In fact these items were made by a local blacksmith and are called sand washers. They were hammered into the back of a wheel hub to prevent sand spilling from a wagon and getting between the hub and the axel. They were used by local farmers who drew sand for the local council for road making.
Everything has a solution if we wait long enough.