Not used to change the timing belt on a BRM
one only needs three tools for that job.
Pin to lock/index the Cam
Crank lock/index for the Crank
Tool to hold/move the Cam when adjusting the timing after installing the belt
These tools can be found from on-line vendors or maybe at times in the classified section.
One note, the tools will be called locking tools, but they really are not for locking/holding the cam/crank, since they are not made to have stress put on them,
they are indexing tools to ensure the cam and crank are index correctly
when changing the belt.