If you perform a search you will find many members have made their own tool or improvised. One member stated "on my 260E 1988 I made it from a 6mm diametre steel rod bended +/- 30 mm at 45degres, total length 300mm."

Like a lot of other members, I used an allen wrench when I removed mine on my '86 300E. One member used an old rat tail file with a bend on the 'handle" end. Any strong metal rod with a short 45 to 90 degree bend will work.