Many viewers at home caught sight of Stacey's affectionate
bottom tap and took to Twitter with divided opinions.
An 8x40 #28 TiN coated drill bit from Brownells (361-651-028) made quick work of drilling the holes for the mount screws, followed up with an 8-40 bottom tap (748-002-840).
The bottom tap is necessary to bring the threads all the way into the blind holes on the barrel.
A bottom tap features almost no taper at all, and is intended to cut threads almost all the way to the bottom of a blind hole.
If you want threads almost all the way to the bottom, a bottom tap would be used after a plug tap cut as many threads as it could.
In some cases, you have to begin by using a starting tap with a high lead on it, followed by a
bottom tap, if it is a blind hole.
At each end of the casing an elbow (
bottom tap) was installed to make the connection from the existing gas main to the new gas main.
I used a size 6-48 screw and a
bottom tap. The receiver is not hardened.
For good squat form, try standing about six inches in front of a chair or bench, and lower your hips until your
bottom taps the seat.