I have a scanner wrench made by Wright tools (#9636, 2” model). It works perfectly. Its width is adjustable. Costs about $40 thru White Cap who is distributor for Wright tools. I needed to tap the end of the tool while holding the tines in the holes with other hand, but it worked perfectly. I ruined my Mark 20’s plate, but after I found this at a garage sale, I feel good about using it in the future. Here’s a photo or twO
Hope this helps