1953 C11 crank shaft compensating nut

N0rt0nelectr@

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I have been working on a 53 BSA C11 for some time and I'm well on my way to getting it up and running.
On the drive side there is a compensating sprocket with a large nut holding it in place. It is in sad shape due to people using chisels to remove the nut.
The nut has 4 1/4" notches machined into it and was wondering if anyone had ever made or purchased the tool to remove and install it?
I have spent some time cleaning up the notches. I am thinking using an impact would be better than going back to the hammer and chisel.
 
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