Ain't that the truth, as I found when cobbling up a weapon of my own to use on a not-pristine nut. Did the job though, and it was easy to get 65 or whatever lbs ft on it. I'm sure the SRM job is a big improvement though.
I've junked the BSA nut and gone for the SRM nut. One seldom mentioned benefit of the SRM nut is that it does no include the perfectly sharp gutting teeth to drill out the chain case in an instant. I've never seen a chain case that's not at least 50% cut through.