Originally Posted by
roth rothar
The Shimano deraileur is designed for a JIS (Japanese standard) screwdriver head, using a Phillip's screwdriver is probably the cause of the damage.
I didn't know there was a difference!!The bike was used when I bought it and the head was not good from the beginning.I usually used a flat head to turn it.Update
erailleur I bought had the wrong clamp size and the correct one is on it's way for much more money.