Yea, the little spring loaded pin that sits inside the gold piece that screws into the bottom. I soaked it once, maybe I'll try again...
If that spring has collapsed then there is a fix to it, it's not a perm fix but it will get your here up and running.
What you need to do is pull the rod out a bit more and it will make contact again.
As for the spare pin we have them online, under the Hercules section or spare parts.