I'm restoring a 4500C foot# 7701 and the o-ring is missing from the right side plate. I already ordered all of the other parts but somehow looked over this one. Does anybody know what size it is? Figure I could probably find one at the hardware store.
EDIT: Never mind, schematic doesn't show one on that side, just the left side. Strange, thought all Ambassadeurs had them under the spool tension caps ???