panel 28 and outer panel 26 define an intermediate cavity 31 into which door related operating components are located and or mounted supports 58 are either formed integrally with inner panel 28 or are attached thereto using an appropriate fastener or adhesive not shown outer panel 26 includes support channels 62 having flanges 63 and which preferably extend the length of the door 10 channels 62 are adapted to longitudinally receive a block 64 along an inside surface block 64 includes a threaded opening 66 which engages a threaded fastener 68 each support 58 includes an opening not shown which is adapted to receive threaded fastener 68 and secured to block 64 upon tightening of threaded fastener 68 into block 64 block 64 and intermediate support 58 are drawn together frictionally contacting flanges 63 and thereby fastening supports 58 and inner panel 28 to outer panel 26 when threaded fastener 68 is loose with respect to block 64 block 64 may be displaced longitudinally within its respective channel 62 this provision of longitudinal displacement is useful for adjusting the position of inner panel 28 with respect to outer panel 26 although supports 58 bear much of the weight of the inner panel 28 and attached components additional fasteners such as screws bolts clips adhesive or rivets can be used to secure the periphery of inner panel 28 to inner sheet 29 of.