(2) Another precaution is that, in thru boring, the holes should not be bored quite thru from one side, lest the wood be splintered off on the back.

When the spur pricks thru, the bit should be removed, the piece turned over, and the boring finished, putting the spur in the hole which is pricked thru in boring from the first side.

It is seldom necessary to press against the knob of the brace in boring, as the thread on the spur will pull the bit thru, especially in soft wood.
Indeed, as the bit reaches nearly thru the board, if the knob is gently pulled back, then when the spur pricks thru the bit will be pulled out of its hole.

This avoids the necessity of constantly watching the back of the board to see if the spur is thru.

(3) In stop boring, as in boring for dowels or in making a blind mortise, care should be taken not to bore thru the piece.