12 the first mounting assembly 34 comprises a first contact pad 70 having an inner surface 74 and an outer surface 72 for contacting the frame member 22 the contact pad is formed from a resilient but sightly compressible material to firmly engage the frame 12 extending from the contact pad 70 is a shaft 76 having a transverse plate 77 on an inner end thereof that prevents the plate 77 and pad 70 from disengaging at a distal end of the shaft 76 is a peripheral groove 78 for receiving a split snap ring 80 therein the first mounting assembly further comprises a first end cap 82 that includes a central opening 83 surrounded by a larger diameter counter bore 84 a flat ring shaped washer 86 is mounted on the shaft 76 and contacts the first pad 70 a plurality of stacked belleville washers 88 are mounted on the shaft 76 between the flat washer 86 and the first end cap 82 to provide a biasing means between the end cap 82 and the pad 70 the stacked belleville washers bias the first pad outwardly when the bar member 10 is rotated to tighten the device within the frame 12 the number of belleville washers may be varied to modify the biasing force stacking washers in the same direction will provide a stronger biasing force with minimal movement of the pad while stacking in alternating directions will provide a weaker biasing force but greater movement of the pad 70 stacking any combinations of oppositely directed and similarly facing washers will allow a manufacturer to create a desired biasing force and displacement range a securing.