As a follow-up to Bart Magoffin's excellent photos he posted in response to Jeff Osborne's query regarding copper pinhole liners, here are two Pyrex CD 122.4 with pin liners attached to each other with a metal strip. The strip was attached to the top of the crossarm with the two small nails which are still present. The wood pins will not unscrew but the liners appear to be identical to the one in Jeff's photo. These were recovered years ago from the Milwaukee Road in Wisconsin.