You don't have to have it, but it's definitely better to have it.
Mounted on MAJESTYS.
It is easy to install, I think STD Shape levers can be installed even with external levers. I use it with KOSO's Lever.
Parking brake cannot be operated with one hand.
Lock with the Right hand while gripping Lever.
It would be more convenient if it could be locked with one hand.

