English is not everyones first language here on RCU. being somewhat of a dim bulb I was able to understand the question, kinda. I bend piano wire all the time without any great problem. I use it once in a while for control rod and a Z-bend isn't that tough, about three times as hard as the soft control rods but I get it done. I do have a big vise with notches filed in it for different size wires. All of my cabane struts and landing gear are bent out of piano wire. There is always a good supply of the stuff in my shop. If heat is added it removes the temper and makes piano wire brittle, I learned that the first time I heated and bent a pair of landing gear. The spar part of the question did throw me for a minute.