Is there a special tool that's used to switch SIS DT shift option between index & friction? I don't want to break anything so I'm wondering what the proper procedure is to turn the "dial/red arrow pointer" from index to the friction option. It seems stuck in my case.

I see there's a tiny hole on one side(11 o'clock position in attached pic) , and another tiny hole with groove the opposite side (can see the groove near the M5 screw). Am I supposed to use a tool to turn it counterclockwise so red arrow currently pointing to "SIS Set" to "Friction Set" ? Thanks!