Internals of a Japanese Sega Mega Drive Arcade Stick?

Hello chaps

I have a spare Sega 6 button arcade stick that I want to convert to have micro switches or tactile switches. Does anyone have any pics of the internals of the Japanese Arcade stick, which I believe has micro switches installed or do they use tactile switches? I had a look I could fit tactile switches, but micro switches would be an epic challenge.

Cheers Pete