Don, it's common knowledge among FP collectors that too large a sac can cause a
pen to leak. Not being a qualified engineer, I have nevertheless fixed a few
"restored" leaky pens by just changing the sac to a smaller size. You don't
need an engineering degree to do this.

At any rate, it seems that you should at least be grateful to Quarterhorseman
for remedying what is, ultimately, an engineering flaw created by YOUR company.
If your pens write well, we wouldn't be having this conversation.

Dik