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Grind your own HSS crowning tools. It ain't rocket science. You can grind a nice inside curve with a high speed rotary grinder.
I just found a nice brass lap (ball on a shaft) by taking apart a single lever bathroom faucet.
Thanks for the input I see a video on the brass screw version on youtube. I'll check it out.
I guess for a $200 gun it doesn't matter if I screw it up.