I need education on the Thermoquad "staged accelerator pump" , that gives an additional shot when the secondaries open

That Vannith TQ guide that used to be over on Moparchat gave detailed instructions how to drill your baseplate out and add the vacuum nipple. I did a 9077 years ago, worked good. I got to the point years ago when I was buying TQ's, that I wouldn't buy one unless it had the vacuum nipple. There were plenty of the early ones around.