Abstract: The present disclosure provides a fastener including (A) a female pin with a first annular wall with a first end and a second end; at least one female arm extending from the first end of the first annular wall, the female arm having a proximal end, a distal end, a female arm outer surface, and a female projection at the distal end that extends from the female arm outer surface; and a ledge at the second end of the first annular wall; and (B) a male pin with a second annular wall having a first end, a second end, and an outer diameter; at least one male arm extending from the first end of the second annular wall, the male arm having a proximal end, a distal end, a male arm outer surface, and a male projection at the distal end that extends from the male arm outer surface; and an annular projection at the second end of the second annular wall, the annular projection having an outer annular diameter that is greater than the outer diameter of the second annular wall.

Abstract: A drawing compass including a body having a pivot point and a longitudinal slot formed therein, the longitudinal slot defining a first inner surface. The drawing compass further includes a carriage received in and movable along the longitudinal slot. The carriage has a guide to receive a writing instrument therethrough and a movable arm biased against the first inner surface. The compass also includes means for releasably coupling the arm to the body.

Abstract: A drawing compass including a body having a pivot point and a longitudinal slot formed therein, the longitudinal slot defining a first inner surface. The drawing compass further includes a carriage received in and movable along the longitudinal slot. The carriage has a guide to receive a writing instrument therethrough and a movable arm biased against the first inner surface. The compass also includes means for releasably coupling the arm to the body.