The TFP1100 Camera Angle Adjuster by Takahashi:

The Takahashi TFP1100 Camera Angle Adjuster attaches to the focuser drawtube of the Takahashi FS-102, FS-128N or TOA-120N and accepts Takahashi wide-mount T-rings, their eyepiece projection adapter, or other camera adapters. Once your camera is connected, it can be rotated to the angle you prefer, and then the Adjuster is simply locked in place for the exposure. 

OPT Product Number: TK-TFP1100

TKA Sku #TAK23200