The Rotor removal tool is a Bolt. M20 x 1.5 mm pitch, and a 32mm open endded spanner...
The silverish bolt (pictured in the Jaws of the spanner) is the rotor holding bolt, undo this take it out then insert the Rotor removal Bolt.
you can buy the bolt for £3.90 from a fastners shop.
before you do this , I'd take out the startmotor and check the brushes or the teeth to make sure that all is well before rotor removal.
hth's