DB rear axle bearing retainer/adjuster tool?

[franklinman]

I am curious if anyone has (or has fabricated) a tool as shown in the Mechanics Instruction Manual for turning the outer rear axle bearing retainer. The retainer has a number of ears around the outer circumference that the tool engages and then can be turned via two handles. Without the tool it appears that all one could do is resort to hitting an individual ear with a hammer and punch, which it looks like a previous owner attempted to do on my car. Several ears are slightly deformed now and I am very reluctant to try doing that further. What method do those of you folks use. My car is a 1925 model.