1984 Mercedes 190 D belt tensioner replacement . I'mstumped!

[bro frank]

I am trying to replace my tensioner. 1984 Mercedes 190 D 4 cylinder. Question can someone please post a a picture of the hole that you're supposed to insert the tool into to stop the water pump pulley from turning see you can take the bolts out of the front of it so that you can change the tensioner! I need my car back as soon as possible. please forgive the typos it seems that my touch screen AndThisPage are not compatible. If possible you can text me the picture at (757) 335-3539. I have read how people have used various tools to get this pullet stationary scad the bolts out, but I have not seen a decent picture of the situation in thE Car Saying " here put it in this spot" . I found two openings in the back that i can get at but when Insert a tool/nail whatever, I don't find a matching hole in the pulley that will stop it from spinning. Frustrated. Help!