the support frame 2 the support strip 8 backed up by the associated leaf spring 9 can exert a constant spring pressure at all times even during the painting process and the subsequent manufacturing processes it is to be noted that in the practice of the present invention the use of the presser protuberance 9c shown and described as formed in each leaf spring 9 may not be always necessary further the entire surface area of the resilient body 9b may be held in contact with the intermediate body 8b of the associated support strip 8 however considering the possiblity that the presence of foreign matter trapped between the resilient body 9b of each leaf spring 9 and the intermediate body 8b of the associated support strip 8 may adversely affect operating characteristics of the cathode ray tube during or after the manufacture thereof the use of the presser protuberance 9c which acts not only as a means for transmitting the elasticity of the associated leaf spring 9 to the support strip 8 but also as a spacer for providing a space between the resilient body 9b of the leaf spring 9 and the intermediate body 8b of the associated support strip 8 is advantageous in that the foreign matter will not be trapped therebetween in view of this the smaller the area of surface of contact between the resilient body 9b of each leaf spring 9 and the intermediate body 8b of the associated support strip 8.