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A general rule of the thumb for removing stuck coil slugs in post-war tube-era sets:
On cardboard or plastic coils, dunk a wooden toothpick in kerosene and deposit a small drop on the joint between the slug and the wall. On plastic, it usually will free up the slug in a few minutes. On waxed cardboard or shellacked cardboard coils, it may take from an hour to overnight.
When putting the slugs back in plastic coils, use no lubrication, unless it is very stiff and then use a little Vaseline.
When putting the slugs back in cardboard coils, dry off the slug, and lightly coat the slug with Vaseline.
Caution: Never mix petroleum-based lubricants with lithium-based lubricants.
James
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