With wartime material shortages, replacement radio parts were hard to come by. And even when parts were available, the manufacturers had to adapt to wartime conditions.
This is illustrated by this ad from the August 1942 issue of Service magazine, showing the Mallory “Wood Neck” condenser (what we would call a capacitor these days). Instead of an aluminum case and base, the capacitor had an impregnated paper case and a threaded wooden base. The ad noted that “they are designed for the emergency but we predict they will be popular long afterwards.”