attachment member is inserted by the needle through the workpiece and emerges in a cavity of the receiver cylinder the cavity being configured to minimize stress on the attachment member during this process application_number US 41279 A description reference should now be had to fig1 through 5 for a detailed description of the powered attaching assembly of the invention the assembly shown in the elevation view of fig3 comprises a fastener inserting machine 20 a receiver cylinder 30 an air cylinder 40 air supply lines and control 50 and a mounting assembly 60 the fastener inserting machine 20 is advantageously of the type disclosed in u s pat nos 3 734 375 and 3 735 908 the machine 20 illustratively includes a machine housing 21 a cylindrical housing 22 a projectible member 23 which holds a needle 24 and a movable jaw 25 high pressure air is supplied to cylindrical housing 22 by an air line 53 as regulated by a control module 57 cylindrical housing 22 contains mechanisms as disclosed for example in the above cited patents which cause the lowering of movable jaw 25 and projectible member 23 the projectable member 23 moves telescopically out of the cylindrical housing 22 when air pressure is applied the cylindrical housing 22 is fixed to the machine housing 21 and the application of air pressure within the cylindrical housing 22 causes the projectable member 23 to move telescopically out of the cylindrical housing 22 movable jaw 25 contains a hole 25h which permits the passage of needle 24 also disclosed are internal means for causing the expulsion of an attachment member through a slot in the needle the above attaching device is well suited to the task of.