A reliable machine shop can cut away a small amout of metal from the aft side of the mounting flange so that the lens will set closer to the film platen . 可以请经验丰富的机械加工车间从安装凸缘的后部切削掉少量的金属,这样就能使透镜更加靠近胶片平面。
Hose clamps - part 2 : clamps with fastening lugs 软管卡箍.第2部分:带紧固凸缘的卡箍
Gypsum ceiling board ; slabs with bulged edge on the reverse 石膏天花板.背面带凸缘的板块