Thanks, maybe he will see your tag and offer some advice.Thinking @Bipeguy03 is your man!
I like the cartoonish one.....
If you stick to about 1.5 x the diameter in radius you should be ok. At 5/8” that is 2x. You may wish to consider some mild steel cold roll rod versus the piano wire or drill rod. Less tendency to crack in those tight bends, but you’ll have less “spring” available to you before it takes a permanent set. Probably doesn’t matter much in that application. Where is the tight radius located and how many degrees are you talking?I have no "Tools" specifically, more than willing to make whatever. My biggest concern is cold bending a large diameter wire, this will be something like 5/16, into a small radius such as 5/8". I don't know if it stresses the metal leaving it vulnerable to breaking. I have made gear with smaller wire a few time's, even did some brazing, without issue.