I always had trouble with the ada bolts. Even after running a tap to clean up the holes, they like to get stuck. Bought a snap on special tool to remove and install studs, still had problems.
Its always one front corner stud that doesnt go in all the way.
From now on, i use the two part type from blowsion. Its worth the extra coin to know your cyl is secure when removing head. And i am over the whole kawi spikes and chain wallet style acorn nuts poor design that ada sells. ADA makes great headshells, domes, couplers and other goods.