Can Platinum Desk Pens be filled using Silicone Grease? Specifically, I'm wondering about the Platinum Fountain Pen DPQ-700A#10 & DPQ-700A#1 using a desk stand for them. If not, what are the requirements for filling a fountain pen & sealing it with silicone grease? I just bought some and have already found tons of uses for it! Any help is appreciated.