A powered tool constructed to drive a driver blade (18) in response to power from a power delivery source (16) to impact a fastener and drive it into a workpiece, comprising: a housing (12) having a main chamber (17) enclosing said power delivery source; a nosepiece (22) associated with said housing to accept a fastener and guide said driver blade toward impact with said fastener, a handle (82); a trigger (20) permitting an operator to actuate the power delivery source; a fastener supply assembly (24) associated with said housing for supplying fasteners into said nosepiece; a tool activation linkage (44) biased into a nonoperational position, and movable into an operational position when said tool is pressed against a workpiece; a fastener follower (46) in said fastener supply means (24); a distance amplifier lockout (52) to amplify movement of said fastener follower (46) when said fastener follower is brought into contact with said distance amplifier lockout in response to ejection of an individual fastener from said tool, said lockout (52) preventing said tool activation linkage (44) from being moved into said operational position.