I find the HCW-5 Lock Ring Wrench a must have tool for every one that has this type of lock ring on there bike.
I find using this lock ring wrench on all of my mounting bikes it locked the ring more than if I just used a screw driver to knock it round not a good way but now we have the HCW-5 it has been a godsend to us working on mounting bikes.
Please keep in mind this HCW-5 will not fix all rings but most of them it will.
Regards Anthony Dacko