I hear ya. I'm in the same boat and I also only get to test my setup on gamedays.
My understanding is that the curved nub helps maintain the curved mound where as a standard nub will press on the highest point of the bucking and possibly negate the curved contact with the BB.
The other wrench, I found, is the barrel. I got lucky that my Deep Fire TB happens to fit the Maple Leaf bucking perfectly. Whereas my brother's Promy Tb doesn't fit the Maple Leaf at all due the the barrel's window size.
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