I know there are metric studs vs imperial. And MannMade bridges were designed to fit their own studs snug. But they even fit the stock PRS studs better than the PRS bridge did. If that makes any sense
I did see that, Les, but a $50 wrench?
Seems to me the right tool to use is the tool that's made to do the job.
In addition to not bunging up the screws themselves, you might want a tool that won't accidentally slide out of the slot and land on the guitar top, which could happen with a regular screwdriver. The sides around that tool surround the screw so that shouldn't happen unless you really screw up.
There is such a thing as 'penny-wise but pound foolish'.
But more power to you if you can get the job done without spending the dough!
My used ZM has studs that looks liked your. All jacked up.Maxime,
It's entirely possible the original owner tried to adjust the bridge studs while they were under tension. I'd prefer to not use a chisel since the edge is sharp and might not be the correct tool for the job. (Could damage the chisel's edge, I'm thinking...).
I do own a small stubby ½" wide screwdriver that might have enough control for removing the old stud screws and installing the news ones. The issue might be intonation. Am hoping John Mann's video also shows how to intonate a wraparound bridge...
the worst is when the bridge falls off and the studs move so you have no idea how high the action was. Always a guessing game. Thats why a MannMade bridge is nice. Doesn't fall off. Or locking studs.
Schroeder locking metric studs every time, Eddie.
My used ZM has studs that looks liked your. All jacked up.