Oculus Rift Avatar SDK and How to Push a Button Using it

Hi all!

I'm trying to find a tutorial on two things related to Oculus Rift Avatar SDK. I have grabbing objects with the touch controllers down, but I am uncertain how to be able to push a button when the pointer finger is extended. Any help would be appreciated!

Also, I still have not seen a clear tutorial on how to integrate custom hand grips when picking up objects. Would love to find something on this too. Thanks!