Here’s some more notes. Post a comment if there’s something you’d like to see that I haven’t put up yet, and I’ll dig it out and put it up, if I’ve got it (maybe even in digital!).
As I said, I am new to this. Have a look at the Sheldon Brown website on the blogroll. It’s the . . . haunch of roast goat? (superlative vapour lock at the mo).