Park Tool 左旋牙 T47 導規 (#648L)

This guide threads perfectly into my T47 frame, making bottom bracket facing much more accurate. The M47 x 1.0 threading is clean and consistent—worth the money for a precise job.

The left-hand threading is spot-on—it threaded onto the T47 shell cleanly and held the guide steady through the entire facing job. No wobble, no fuss, and it saves a ton of time when I’m prepping a frame. This is a solid little tool that does exactly what it’s supposed to.