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Silica gel is a good idea but it absorbs only so much moisture and can do no more (ie: it changes colour from blue to pink...sometimes the beads turn white).
You can re-activate the gel sachet buy putting it in the oven on a low temp to draw the moisture out or the beads. But, you cannot do this if the sachet is in the OTA.
Better to have a sachet in the SCT visual back assembly, maybe put the sachet in a holder like an old plastic film cannister that has holes in it that lead into the OTA.
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