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Go on and make some of these already
I have a CL→IS adaptor, need a cheap CL wheel to experiment with before going anywhere near the question of making CL sprockets. I have a feeling the man with all the broaches won't have the CL broach as the combination of diameter and tooth count doesn't seem to occur in any of the usual industrial standards, so that would probably be the death of the idea as getting a broach of my own would be a couple of grand.
Go on and make some of these already, so people can throw money your way.
I love the idea of this.