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If the hole is dry or dripping very slowly, make a new hole a few inches away and put the old tap into the new hole, it will immediately start trickling out. It the sap was already running in that hole, stick the tap back into it.
This is not typically recommended, and anyone who does it should be aware that putting in a second hole will create a second wound in the tree that the tree has to recover from. Putting a second tap in the tree (unless the tree is large enough to support a second tap) is definitely not standard, is not recommended, and, if repeated over time, is not sustainable practice.