I make sure once the hole is drilled the guard goes back on the Fin-Bore III. It's so easy to dull/destroy those blades. I'm on my third season with a lot of holes drilled, still cuts through ice like butter!
Is your Paypal account verified? If not, this is most likely the reason why it won't go through..
I never have issues paying for anything via Paypal. Even shipping to a US address and my Canadian billing address..