thrust button removal?

Sorry to hi-jack,k but how difficult is it to install the thrust button? Bought a complete SG chunk from another member where the button has been removed (but included). Was planning on using original bearings but if re-installation is a PITA, guess I could use green bearings (but don't really want to).

It can be done, but is more of a PITA than removing it. The original style like the one picture above was installed and then the end was braded to hold them together. Some aftermarkets used a roll pin which is easier to install without taking the SG apart. It will take two people, one to hold one button with the roll pin installed and slid in the hole while you install the second half from the other side and drive it onto the roll pin.