Guild Wars 2

It says that to get a charged hammerhead (which gives me the machined which gives me a step further to get the Fix-r-upper) “Charge an Oiled Orichalcum Hammer Head at any Place of Power in Magus Falls” basically I need a commune hero point. Can I use an already used commune spot or do I have to use a new one? and Hypothetically speaking what would happen if I “have used all the commune hero points in the jungle”? would the collection be “impossible”?

You can use an already used one.