A float and/or strike indicator for fly fishing may be attached by friction/interference fit onto a line or leader, by sliding the float up the leader to a thicker-diameter portion of the leader for a tight fit between the leader and an axial bore in the float. The bore may be tapered in diameter, may have a constant diameter, may have a significantly reduced or tapered diameter or another restriction in a portion(s) of the bore, and/or may have an enlarged end opening, for example. The floats may include one or more protrusions into which a small diameter end of the axial bore extends, and, during installation on the line/leader, the protrusion may be removed but snapping or cutting to reveal the bore so that that line/leader may be inserted all the way through the float and accessed at the small diameter end of the bore.