This timing chain tensioner assembly tool is used to place the correct tension on the timing chain before performing the cam alignment procedure (using the valve locking tool TOA27790)

Important to note - when using this tool, hand tighten it on the chain slider. DO NOT use a wrench/spanner on it! This tool does not have a spring unlike the OEM tool. This spring is designed to limit the amount of torque on the chain guide so that you do not tighten in until it cracks. This is why with this tool it is important to hand tighten it, and you will be able to feel when the guide is pushing the chain which is when you then stop tightening it and continue with the engine work. 

For the right hand side, on R1200 models leave a 10 mm gap between the brass part and the engine, since it does not protrude all the way in like on the left hand side.