You can see a couple of pics of Del's DIY tool by clicking on the post link. Maybe
@Del could give us the measurements.
I did something similar but welded a socket onto the end of it
you need the later one with the welded bent washer on it
col as del's is for the earlier models .
just for info on either tool the pipe needs to be big enough to clear the nut on the damper rod i think thats 12mm but will check and modify the post .

As to the pic I attached, the guy owns a K3,so this should work. Dimensions: 40cm long, 22mm outer diameter, the 2 noses are 3mm wide and 5mm deep. 2 noses are a bit easier to make than 4.