Glued the upper saucer to the lower today at lunch using Testors cement. Clamped up to dry:

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IMG_4710 by trekriffic, on Flickr

After an hour clamps were removed and I found some areas on the rim where the Testors cement didn't hold. I was afraid of this as by the time I finished coating the mating surfaces some of the glue had partially dried. I used Ambroid ProWeld liquid cement to seal the breaches injecting it between the saucer halves using a disposable hypodermic syringe my father-in-law had given me. It did the trick. Then I clamped it up and left to dry again:

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IMG_4713 by trekriffic, on Flickr