base plate 301 returning to fig6 and 6 a u2014 6 c a top piece 605 is fixedly attached to the chassis 303 u2014 such as by screws or bolts not shown using fastener holes 607 or any other known manner the rear support top piece 605 and bottom piece 601 are aligned via a guide pin 609 and a socket 611 and a separately aligned set screw 613 sleeved socket 615 retainer clip 617 and threaded hole 619 as shown in fig3 a the pen carriage chassis 303 is provided with appropriate apertures 311 matching the attachment hole 415 for the front supports 401 402 and the fastener holes 607 of the rear supports 403 404 adapted for use with appropriate fastening mechanisms chosen for any specific implementation the design should be such that the supports 401 404 are distributed with respect to the base 301 with x axis and y axis displacement such that the chassis 303 is substantially impervious to vibrations transmitted by motion of the carriage 109 if necessary an access port 313 through the chassis 303 is provided for inserting an appropriate adjustment tool into the set screw 613 the operation of the ink jet pen carriage chassis mounts is schematically depicted in fig7 a and 7b greatly exaggerating possible adjustment position extremes to demonstrate the nature of the invention all four supports 401 404 are used to set the z axis printhead s to paper distance theta x printhead pitch and theta y printhead roll adjustments are then fine tuned using the set screws 425 613 of the front and rear supports 401 404 the pitch of the threads of each set screw 425 613 and its respective associated threaded hole in the supports 423 601 determine.