I am trying to replace 2 screw/bolts from a pine bed, that got lost while moving house. The screw/bolts are 6mm x 115mm & anchored by metal cylinders - what are these called? each is 20mm long with a threaded hole at the very end for the screw/bolt, & 10mm diameter with screwhead so you can hold them still thru one hole in the bedframe while you put the screwbolt thing thru the other. I managed to get 6mm x 100mm screw/bolts but can't find the cylinder things, does anyone know what they're called or where to get them? maybe a wholesale place that supplies furniture makers?