Just got a response back from my friend here in Winnipeg about his Plates, Mounting No.1 and he confirms an unpainted underside. The top of his has been painted flat black by hand at some time. One can make out some brush marks on the larger surfaces apparently and some drips down the edge on one side, so his might have been all plated metal originally. Chips in the paint show plated metal beneath and no sign of a primer.
Thin head hex bolts used for all three items attached to the plate.
Chris: I have seen those little spring retainers on the four hex bolts BA No.2 that bolt the assembly to the top of the transceiver used with some other piece of equipment at one time, but I am beggared if I can remember what piece of equipment! Whenever you get around to tracking your Plates, Mounting No.1 down, can you spec out these four BA No.2 hex bolts for us? Total shaft length, length of thread and how far from the head the retaining clip slot has been cut?
When I think of it, it makes sense they used thin head hex bolts to mount this Plates assembly. Not enough room around the variometer to get at cheese head slotted screw with a screw driver. Would think one has to be careful tightening them, however. With the shaft cut for the retaining clips I could see the bolts shearing easily at that point if you had some knuckle dragger working the spanner!
David
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