I have a plastic cabinet tabletop 19DC12 and my focus pot is in the "vert centering" apron hole as well. I thought it was an upgrade mod.
I also had a 19DC11 set that was otherwise identical and had the divider resistor like Tom's earlier set. The focus control was mounted on a fiberglass board at the fly and the control had a long shaft that stuck out the back.
As I recall, the focus was better on the 19DC11 but I gave it to Bryan Gadow in one our frequent set-swaps.
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"When resistors increase in value, they're worthless"
-Dave G
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