On some through tenon joints, it is a nice touch to "pin" the joint together.    Now, how would one get the joint nice and tight?    A process called draw boring.     One drills the hole through the outside faces of the joint.   Then fit the tenon into the joint.    Make a mark on the tenon as to where the CENTER of the hole falls.     Pull tenon back out.    Now, make a mark on the tenon's shoulder side of the first mark.   Go about 1/4-1/2 the diameter  of the hole back towards the shoulder of the tenon.    Drill this mark.     Now, re-fit the tenon into the joint ( glue if you like) and install the pin(s).     It helps if the end of the pin has a point on it.   As you drive the pin "home" joint will get a lot tighter.    Trim the ends of the pins as needed.

 

 

When I made a couple of louvered passage doors ( way back when) I used this method to draw the joints together.    Along with a couple wedges, and two draw-bored pins per joint, NO GLUE was needed.    Both doors were delivered "pre-hung" and ready to go in their openings.    One was a full louvered door, the other was only half.     Both are still in use.    Doors were straight grained fir, and painted. 

 

Just a tip.

 On this bench, all M&T joints have been pegged.   I used some tongues that I ripped off from the T7G boards in the seat.   I sharpened on end of the homemade pegs, drilled a hole through the joints.    I drove the pins home, and sanded off the excess.    When done, the pegs looked square in section.     A "Square peg in a round hole" sort of thing.     I used the draw-bore trick to make the joint tight.   Bench in this picture has been sitting out on a back porch for over three years now, joints still nice and tight.