I was told even before they started numbering the pins in 1993 that if you saw a cue with a big,oversized center-drilled hole,that there was a STRONG possibility it was a Kersenbrock,or at least one he had some connection to.
It was also said that the precisely driilled versions were almost always Jerry's. Tommy D.
Though David did use pins with the big hole, so did the SW shop in the 80's.
I know David helped out in the SW shop sometime between 84' and 88' and I can remember those cues that I saw, like the authenticated SW I have from 87' as well, having a big hole. They might have even been from Davids orignal shop that Jerry had.
When I worked at The Chicago Board of Trade from 85' to 89' I saw a lot of SW and Kersenbrocks because John Wright used to work there as well until late 87' or thereabouts and would bring his 12x24 dealer case with him frequently with a new batch of cues. I believe ALL the cues I saw of his, SW & Kersenbrock (alleged), had the pig hole pin.
I'm just trying to see if anybody had a cue built in that same time frame or even earlier that had a SMALL hole like the picture I and PoodlePuncher posted.