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From owning a CTC-4 with the same CRT mask assembly I can tell you the following: The black goo was once a rubber gasket. They degrade differently with each sets' unique storage conditions (mine was partially melted partially intact/rotted dry/gummy). That brass bezel is best polished with Brasso and an old (not going to be used on you again) toothbrush....Vigorously brushing while the Brasso is wet. Afterwords you will need to run steel wool or scotch-brite up and down the length of the strip to restore the "brushed" finish to the metal....The brass on my CTC-4 was nearly black.
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