I've had really good luck lately using a Uni knot in place of a nail knot. The Uni-to-Uni is my replacement for a blood knot as it allows materials of widely different diameters to be joined in a very strong knot. It works great joining monofilament or fluorocarbon to gel-spun polyethylene lines. It's also easy to tie without my reading glasses ( a big plus on the water). The only kicker is that it might need to be adjusted a bit to get the tag end to lie parallel to the line/leader instead of jutting off at an angle.
Here's a link to the U2U knot: http://www.berkley-fishing.com/tips/...ntentId=5&All=
The company is not a sponsor, but the info is worthwhile.
The address posts as a hot link, and I'm not sure how to delete that function...