yes they do. but you isolate them via the teflon part. the hole in the pcb fits the teflon ring leading to no contact to the pcb. top and bottom part are conducting, but no contact to the pcb is there as the teflon parts isolates.
Great thanks! The holes in my pcbs were a bit too small to fit the teflon part in, so I carefully widened them with a small pointed file.
I'm still hunting for the large value resistors: 33M, 68M, 220M and 1Gohm. Has anyone found a good source for these recently?