Hi Larry,
The box section tool I was first thinking of was for the valve collets, the rocker arm tool is as per the attached photos. It’s just a piece of 25x4mm mild steel with the arm about 85cm and the S head about 15cm in total. The head is placed under the cam shaft and the heal on the valve spring to compress it a little and allow removal of the rocker arm, just remember to have the relative piston at BDC to avoid any conflict. Even with the correct MB tool some adjusters can only be moved by removing the arm and using a socket. Hope that helps.