I almost broke my finger once. Never again. Also if one side broke, I'd
have both sides replaced. Rub the new springs with oil soaked rag. Dry
running springs shortens the life. I was told by the door guy.
Tony
=======================================
I honestly can not see how putting a thin coating of oil on the spring
will increase its lifetime...Rust prevention ? I just do not know,
or I am not awake enough this morning to really think.....

Other that I also find it hard to imagine how a torsion spring would
break in normal operation...

Bob G.