Richard.
That Seating Plate is an odd little sucker.
It is not a casting, just a piece of stamped sheet steel. On the Wireless Set No. 19 Aerial and Variometer Seating Plates No. 4, that item is spot welded to the Plates No. 4. For the use you are wanting, it has two small rectangular strips of the same guage steel spot welded to it to fit the two large slots under the Packing Plate. Frankly, it strikes me in most applications as being quite redundant and I have seen as many, if not more, Packing Plates of Wood, Rubber or Bakelite with it not installed underneath, with no apparent ill effects.
David
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