7 Inch Hopson-Brooke Mill Base Bolt;

[alwion]

Thanks John, that would make sense.

Mike, tell me if i'm off track here on your bolt. Chill nose hardening made the nose harder than the ctr and base. Think it "flared in the middle" from the impact before it sheared?  I would bet the base is mushroomed reverse of the nose

[emike123]

Sounds right to me.

[John D. Bartleson Jr.]

Mike,
If you are talking about the Hopson-Brooke, then take my forst set of questions to him. Although I have emailed him.
John