He drilled the hole out? He could've just filed down the threads inside the base-plate hole a little and would've slid right in, worked that way for me on three trems(2 Edge, 1 LoPro7).. Either way, the hole in your Floyd Pro is probably going to be too big for an Edge/LoPro arm.. Never tried it, so I can't be sure, and I sold my Floyd Pro 6 months ago, so I can't check..
You should be able to get a regular Floyd bar assembly easy, F*nder sells them in a blister pack for like $12, I think..
