Find a local lender. Otherwise, more often than not, you'll end up getting one of these guys: http://www.thescambaiter.com/
Did you actually read my earlier post to you (repeated above for your convenience)? Frankly, it appears that you are the one who has yet to do any thinking here.
If you can go for 3 MM you can borrow from IB. They lend at LIBOR + .25% for debit balances of 3 MM or more. That would be roughly 5.25% right now. This assumes your bonds are marginable. You're making a huge bet on the yield curve if you try to borrow short-term to pay for long-term bonds. Banks go broke doing this. Traveler
You are assuming virtually no credit risk premium? That's a rather generous assumption regarding our new friend's credit worthiness, don't you think? Further, I did not get the impression that he was looking to subject himself to interest rate risk, judging by his posts. Unless I am mistaken, I think he wants to lock in a risk-free spread. I think Electric said it best: "No."
I'm betting the OP isn't going to put his leveraged 1 MM cash into an instrument of the same duration and risk. He could probably build the same position in the derivatives market without doing all the borrowing. Traveler