turning of the walls 19 and diaphragm 17 tothe thin outer dimensions after the diaphragm 17 the flexspline walls 19 and mounting flange 22 areall turned to the appropriate outer configuration as shown in fig2 d themandrel with the flexspline assembly 15 thereon is removed and the combination is heated to just above the melting pointing of the low melting point alloy steel for example to about 130 degrees fahrenheit wherein the mandrel and alloy are removed from the flexspline assembly 15 the finished flexspline 15 is a component of a harmonic drive assembly 30 as shown in fig3 which includes a first output shaft 32 having a distalend 34 which is secured to a flange 36 the flange 36 is bolted to the first closed end 38 of a circular spline 40 the circular spline 40 comprises a rigid annular housing having a second end 42 on which there isdisposed an array of radially inwardly directed circular spline teeth 44 the closed diaphragm end 17 of the flared flexspline 15 is disposed withinthe bore of the circular spline 40 the flared flexspline 15 includes a cupshaped wall having its diaphragm 17 across its distal end the flared end 21 of the flexspline 15 critically is integral with the mounting flange 22 the flexspline assembly thus critically being made of one.