I'm just finishing up a vintage Mickey Mouse watch with a Timex #24 movement. I performed cleaning per the Timex 24 service manual, which includes removing the balance and hairspring assembly. For future reference I need help in dealing with the too-soft brass V-Conic screw.
I am not in the habit of rounding out screw slots, yet after carefully shaping my screwdriver tip and working as slowly and carefully as I could, I managed to mangle the balance screw slot anyway as the force required to turn the screw was apparently greater than the integrity of the brass Timex used for this part in this movement.
I've seen photos of a #25 movement which also employs the V-Conic assembly, but did not appear to have the same soft brass balance screw. If anyone here has experience with this and can offer advice, please comment. Thanks!