Proverbs 23:The rod is just a measuring stick like a staff.
It's not used to BEAT people with...but to lead and guide
11For their redeemer is mighty; he shall plead their cause with thee. 12Apply thine heart unto instruction, and thine ears to the words of knowledge. 13Withhold not correction from the child: for if thou beatest him with the rod, he shall not die. 14Thou shalt beat him with the rod, and shalt deliver his soul from hell. 15My son, if thine heart be wise, my heart shall rejoice, even mine. 16Yea, my reins shall rejoice, when thy lips speak right things. 17Let not thine heart envy sinners: but be thou in the fear of the LORD all the day long.
A "staff", among other things, was used like a cane, to steady the shepherd on uneven or stony terrain. If it had a "crook" it could be used to catch a sheep. A ''rod'', speaks of power; a weapon. It could prod a sheep out of the way to avoid tripping over it or to strike an unruly/dangerous ram across the nose to protect the shepherd from being "rammed" : This was and is an ever-present danger for shepherds. Even modern shepherds will tell you "never turn your back on a ram".. But here, it is speaking of "measuring"? I don't think so.