If you thought changing a Car Tire was hard . . .
The spoked part is equivalent to a car's 'rim' (don't know what it's called), the outer part is actually called the "tire", and tires wear out and have to be changed. (That's what's being done here.) The two parts make up the "drivers". I guess AAA doesn't do steam engine tires. ;^)
|Moon 99% D55 C14 St-Zénon 20170806 DP by MarioSS|
from Best Picture of the Week
|Reeds on lake by kkardster|
from Abstracts in Nature
|Florence & the Machine by Dutch Newchurch|
from Second chances..