The center of the glow plug hole is at the end of the stick. It is in the middle of 2 rows of the lengthwise holes on the outer chamber. I dont know if there is enough clearance between glow plug element and the stick if they are alligned. It may have to be offset to clear. On my Kj66 the glow plug is in between two sticks. I did the glow plug fitting a little different then the plans. I turned a .375" od glow plug fitting with a small shoulder at the bottom of .275" od and .030" long. I drilled the hole in the chamber a little bigger than the .275 so the plug fit in tight then silver soldered it in place.

I have not welded the end plate with the sticks into place yet. I will try and get a pic of the alignment I plan to use.

The holes are all flat, not flared at all.

Geoff