What I know about that kind of buttons:
The more bigger the button, the more easily you hit the button outside of the center, the more easily you can't press it down anymore, the more you have to deliver a perfect work with tight fitting on the buttons.
The big buttons from Tom Abrahamson are used on the Made in Germany Leica M-Modells. The smaller buttons are made for the high quality Leica copies, like the Voigtlaender.
Andreas
The more bigger the button, the more easily you hit the button outside of the center, the more easily you can't press it down anymore, the more you have to deliver a perfect work with tight fitting on the buttons.
The big buttons from Tom Abrahamson are used on the Made in Germany Leica M-Modells. The smaller buttons are made for the high quality Leica copies, like the Voigtlaender.
Andreas