Rīks Cyclus Tools for bottom bracket tapping T47 (720175) TOOL481
With the Cyclus Tools Threader Professional for T47 Standard thread you'll generate optimal concentricity of the bottom bracket's shell thread.
Insert both sides of the threader simultanly to avoid canting.
The usage of appropriate cutting oil is necessary.
Attention: letters and marks on the tool refer to the tool itself, not the frame (e.g. "R" means you have to turn the tool to the right, "L" means turn to the left!)