DarkstarProject/darkstar — pull request #171 by starlightknight (2014-04-26 15:34:51+00:00)
Title: SCRIPTS: Twinkbrix: Implement Dice Game / Mine Shaft 2716 Warp

If you talk to Twinkbrix in Oldton Movalpolos, there is an event to play a game with him by trading up to 10,000 gil. After you trade gil to him, he'll roll the dice. The more gil you trade, the better your chances of winning the game. If you win, you get key item SHAFT_GATE_OPERATING_DIAL

If you trade him 2000 gil while having this key item, he'll warp you to Mine Shaft 2716.

The key item itself is ultimately used to enter ENM60 Pulling the Strings, which isn't implemented yet. However, it was also always a handy way to warp over to Mine Shaft 2716 solo.
Holding on to the key item instead of doing the ENM allows you to use him as a warp NPC to Mine Shaft 2716. I used to do this when I played retail (and the ENM too)

Reference: http://wiki.ffxiclopedia.org/wiki/Twinkbrix