Hello Patrick
Does this help?
Geoff
PS "Ah, right... that explains the washer in the Pershing (T26E1) installation kit - it's to cover the large hole for a U.S. aerial feedthrough in the turret roof, and the "Plates, Packing" is to centre the aerial feeder in the hole"
Perhaps the hole in a US tank was larger than on a British tank as mentioned, but the washer centres the Variometer in the hole and the Plate, Packing, No.1 keeps the Variometer from spinning as the window was set at Position 8 (Vario was to the drivers side of the WS19 set).
PPS There were also 2 metal channels included with the parts mentioned. They were bolted to the radio shelf, with the shock mounts bolted on top and then the wireless set, creating a space under the set of about 3".
