@Reedt2000 was probably taking bets on how long it would take for me to come back with actual numbers and photos...
The drill hole has to be 0.86", and the OD of the ElectroSocket flange is 0.991". So not much room for mistakes or chips.
If you set a standard Switchcraft 12b jack to the recommended depth...
View attachment 4672640
...you cant plug in some right angle connectors. Like my old Monster Bass 500 cable here
View attachment 4672642
If you back it out (not all that great looking IMO)
View attachment 4672641
you can use right angle connectors.
View attachment 4672643
Yes, I happened to have a 20 year old Electrosocket sitting here.